[mlir] Let ModuleTranslate propagate LLVM triple

This adds LLVM triple propagation and updates the test that did not check it properly.

Differential Revision: https://reviews.llvm.org/D92182

mlir/lib/Target/LLVMIR/ModuleTranslation.cpp

@@ -946,6 +946,9 @@ std::unique_ptr<llvm::Module> ModuleTranslation::prepareLLVMModule(
   if (auto dataLayoutAttr =
           m->getAttr(LLVM::LLVMDialect::getDataLayoutAttrName()))
     llvmModule->setDataLayout(dataLayoutAttr.cast<StringAttr>().getValue());
+  if (auto targetTripleAttr =
+          m->getAttr(LLVM::LLVMDialect::getTargetTripleAttrName()))
+    llvmModule->setTargetTriple(targetTripleAttr.cast<StringAttr>().getValue());
 
   // Inject declarations for `malloc` and `free` functions that can be used in
   // memref allocation/deallocation coming from standard ops lowering.

mlir/test/Target/llvmir.mlir

@@ -1319,6 +1319,7 @@ module attributes {llvm.target_triple = "x86_64-pc-windows-msvc"} {}
 // -----
 
 // CHECK-NOT: "CodeView", i32 1
+// CHECK: aarch64-linux-android
 module attributes {llvm.target_triple = "aarch64-linux-android"} {}
 
 // -----