[ELF][RISCV] Support PLT, GOT, copy and relative relocations

* Handle initial relocation types: R_RISCV_CALL_PLT and R_RISCV_GOT_HI20.
* Produce dynamic relocation types: R_RISCV_COPY, R_RISCV_RELATIVE, R_RISCV_JUMP_SLOT.
* Define SymbolRel as R_RISCV_{32,64}
* Generate PLT header: it is used by lazy binding PLT in glibc.
* R_RISCV_CALL is changed from R_PC to R_PC_PLT. If the target symbol is preemptable, this will suppress an unnecessary "canonical PLT".
  This behavior is different from ld.bfd but it is agreed the current lld behavior is favored.
  I have received positive responses from the binutils maintainer that the ABI/binutils implementation can be improved, see:
  https://github.com/riscv/riscv-elf-psabi-doc/issues/98
  https://sourceware.org/bugzilla/show_bug.cgi?id=24685

Many -no-pie/-pie/-shared programs linked against musl or glibc should work with this patch.

Reviewed By: jrtc27

Differential Revision: https://reviews.llvm.org/D63076

llvm-svn: 364812

lld/ELF/InputSection.cpp

@@ -587,7 +587,7 @@ static Relocation *getRISCVPCRelHi20(const Symbol *Sym, uint64_t Addend) {
                        });
 
   for (auto It = Range.first; It != Range.second; ++It)
-    if (It->Expr == R_PC)
+    if (It->Type == R_RISCV_PCREL_HI20 || It->Type == R_RISCV_GOT_HI20)
       return &*It;
 
   error("R_RISCV_PCREL_LO12 relocation points to " + IS->getObjMsg(D->Value) +