MS inline asm: remove obsolete code adding AOK_SizeDirective (e.g. dword ptr)

The AOK_SizeDirective part from 5b37c18129
(2014-08) seems unneeded nowadays (the root cause has likely been fixed
elsewhere). The part abuses that `call dword ptr foo` assembles the same way as `call
foo` in Intel syntax, which is going to be fixed (changed) by D149579.

The generated object files for
CodeGen/ms-inline-asm{,-functions,-variables,-static-variable}.c and
CodeGenCXX/ms-inline-asm-fields.cpp are unchanged
(-mno-incremental-linker-compatible) with just this patch. When D149579 is
subsequently applied, the FIXME part of `kptr` in
CodeGen/ms-inline-asm-functions.c will be fixed.

Differential Revision: https://reviews.llvm.org/D149695

clang/test/CodeGen/mozilla-ms-inline-asm.c

@@ -27,7 +27,7 @@ void invoke(void* that, unsigned methodIndex,
 // CHECK-SAME: sub esp,eax
 // CHECK-SAME: mov ecx,esp
 // CHECK-SAME: push $0
-// CHECK-SAME: call dword ptr ${2:P}
+// CHECK-SAME: call ${2:P}
 // CHECK-SAME: {{.*}}__MSASMLABEL_.${:uid}__noparams:
 // CHECK-SAME: mov ecx,$3
 // CHECK-SAME: push ecx

clang/test/CodeGen/ms-inline-asm-64.c

@@ -68,7 +68,7 @@ void t5(void) {
   }
   // CHECK: t5
   // CHECK: call void asm sideeffect inteldialect
-  // CHECK-SAME: call qword ptr ${0:P}
-  // CHECK-SAME: jmp qword ptr ${1:P}
+  // CHECK-SAME: call ${0:P}
+  // CHECK-SAME: jmp ${1:P}
   // CHECK-SAME: "*m,*m,~{dirflag},~{fpsr},~{flags}"(ptr elementtype(void (...)) @bar, ptr elementtype(void (...)) @bar)
 }

clang/test/CodeGen/ms-inline-asm.c

@@ -312,7 +312,7 @@ void t24_helper(void) {}
 void t24(void) {
   __asm call t24_helper
 // CHECK: t24
-// CHECK: call void asm sideeffect inteldialect "call dword ptr ${0:P}", "*m,~{dirflag},~{fpsr},~{flags}"(ptr elementtype(void ()) @t24_helper)
+// CHECK: call void asm sideeffect inteldialect "call ${0:P}", "*m,~{dirflag},~{fpsr},~{flags}"(ptr elementtype(void ()) @t24_helper)
 }
 
 void t25(void) {
@@ -684,7 +684,7 @@ void dot_operator(void){
 void call_clobber(void) {
   __asm call t41
   // CHECK-LABEL: define{{.*}} void @call_clobber
-  // CHECK: call void asm sideeffect inteldialect "call dword ptr ${0:P}", "*m,~{dirflag},~{fpsr},~{flags}"(ptr elementtype(void (i16)) @t41)
+  // CHECK: call void asm sideeffect inteldialect "call ${0:P}", "*m,~{dirflag},~{fpsr},~{flags}"(ptr elementtype(void (i16)) @t41)
 }
 
 void xgetbv(void) {

clang/test/CodeGen/ms-inline-asm.cpp

@@ -109,7 +109,7 @@ void test5() {
   __asm mov x, eax
   // CHECK: call void asm sideeffect inteldialect
   // CHECK-SAME: push $0
-  // CHECK-SAME: call dword ptr ${2:P}
+  // CHECK-SAME: call ${2:P}
   // CHECK-SAME: mov $1, eax
   // CHECK-SAME: "=*m,=*m,*m,~{esp},~{dirflag},~{fpsr},~{flags}"(ptr elementtype(i32) %y, ptr elementtype(i32) %x, ptr elementtype(i32 (float)) @_ZN2T5IiE6createIfEEiT_)
 }

clang/test/CodeGen/ms_this.cpp

@@ -20,7 +20,7 @@ void t2::runc() {
       mov rax,[this]
       // CHECK: [[THIS_ADDR_T2:%.+]] = alloca ptr
       // CHECK: [[THIS1_T2:%.+]] = load ptr, ptr [[THIS_ADDR_T2]],
-      // CHECK: call void asm sideeffect inteldialect "mov rax,qword ptr $1{{.*}}ptr [[THIS1_T2]]
+      // CHECK: call void asm sideeffect inteldialect "mov rax,$1\0A\09mov rbx,[rax]\0A\09mov $0, rbx", "=*m,m,~{rax},~{rbx},~{dirflag},~{fpsr},~{flags}"(ptr elementtype(double) %num, ptr [[THIS1_T2]])
       mov rbx,[rax]
       mov num, rbx
 	   };
@@ -33,7 +33,7 @@ void t1::runc() {
        mov rax,[this]
        // CHECK: [[THIS_ADDR_T1:%.+]] = alloca ptr
        // CHECK: [[THIS1_T1:%.+]] = load ptr, ptr [[THIS_ADDR_T1]],
-       // CHECK: call void asm sideeffect inteldialect "mov rax,qword ptr $1{{.*}}ptr [[THIS1_T1]]
+       // CHECK: call void asm sideeffect inteldialect "mov rax,$1{{.*}}ptr [[THIS1_T1]]
         mov rbx,[rax]
         mov num, rbx
 	   };
@@ -46,7 +46,7 @@ struct s {
     __asm mov rax, [this]
     // CHECK: [[THIS_ADDR_S:%.+]] = alloca ptr
     // CHECK: [[THIS1_S:%.+]] = load ptr, ptr [[THIS_ADDR_S]],
-    // CHECK: call void asm sideeffect inteldialect "mov rax, qword ptr $0{{.*}}ptr [[THIS1_S]]
+    // CHECK: call void asm sideeffect inteldialect "mov rax, $0{{.*}}ptr [[THIS1_S]]
   }
 } f3;
 

clang/test/CodeGenCXX/ms-inline-asm-fields.cpp

@@ -53,4 +53,4 @@ template void msvc_dcas_x86<false>::store();
 // CHECK: %[[P:.*]] = alloca %"struct.make_storage_type<false>::type", align 4
 // CHECK: %[[B:.*]] = getelementptr inbounds %"struct.make_storage_type<false>::type", ptr %[[P]], i32 0, i32 0
 // CHECK: %[[X:.*]] = getelementptr inbounds %"struct.make_storage_type<false>::type::B", ptr %[[B]], i32 0, i32 1
-// CHECK: call void asm sideeffect inteldialect "mov edx, dword ptr $0", "*m,~{edx},~{dirflag},~{fpsr},~{flags}"(ptr elementtype(i32) %[[X]])
+// CHECK: call void asm sideeffect inteldialect "mov edx, $0", "*m,~{edx},~{dirflag},~{fpsr},~{flags}"(ptr elementtype(i32) %[[X]])

llvm/lib/Target/X86/AsmParser/X86AsmParser.cpp

@@ -1748,12 +1748,6 @@ bool X86AsmParser::CreateMemForMSInlineAsm(
   // If we found a decl other than a VarDecl, then assume it is a FuncDecl or
   // some other label reference.
   if (Info.isKind(InlineAsmIdentifierInfo::IK_Label)) {
-    // Insert an explicit size if the user didn't have one.
-    if (!Size) {
-      Size = getPointerWidth();
-      InstInfo->AsmRewrites->emplace_back(AOK_SizeDirective, Start,
-                                          /*Len=*/0, Size);
-    }
     // Create an absolute memory reference in order to match against
     // instructions taking a PC relative operand.
     Operands.push_back(X86Operand::CreateMem(getPointerWidth(), Disp, Start,