AMDGPU: Replace deprecated FK_PCRel_ with FK_Data_ fixup and PCRel flag

We will unify the generic fixup kinds FK_Data_ and FK_PCRel_. A
FK_PCRel_ kind is essentially the corresponding FK_Data_ fixup with the
PCRel flag set.

Author: MaskRay

llvm/lib/Target/AMDGPU/MCTargetDesc/AMDGPUAsmBackend.cpp

@@ -94,7 +94,6 @@ static unsigned getFixupKindNumBytes(unsigned Kind) {
     return 2;
   case FK_SecRel_4:
   case FK_Data_4:
-  case FK_PCRel_4:
     return 4;
   case FK_SecRel_8:
   case FK_Data_8:
@@ -121,7 +120,6 @@ static uint64_t adjustFixupValue(const MCFixup &Fixup, uint64_t Value,
   case FK_Data_2:
   case FK_Data_4:
   case FK_Data_8:
-  case FK_PCRel_4:
   case FK_SecRel_4:
     return Value;
   default:

llvm/lib/Target/AMDGPU/MCTargetDesc/AMDGPUELFObjectWriter.cpp

@@ -69,8 +69,6 @@ unsigned AMDGPUELFObjectWriter::getRelocType(const MCFixup &Fixup,
   MCFixupKind Kind = Fixup.getKind();
   switch (Kind) {
   default: break;
-  case FK_PCRel_4:
-    return ELF::R_AMDGPU_REL32;
   case FK_Data_4:
   case FK_SecRel_4:
     return IsPCRel ? ELF::R_AMDGPU_REL32 : ELF::R_AMDGPU_ABS32;

llvm/lib/Target/AMDGPU/MCTargetDesc/AMDGPUMCCodeEmitter.cpp

@@ -656,16 +656,11 @@ void AMDGPUMCCodeEmitter::getMachineOpValueCommon(
     //
     // .Ltmp1:
     //   s_add_u32 s2, s2, (extern_const_addrspace+16)-.Ltmp1
-    MCFixupKind Kind;
-    if (needsPCRel(MO.getExpr()))
-      Kind = FK_PCRel_4;
-    else
-      Kind = FK_Data_4;
-
+    bool PCRel = needsPCRel(MO.getExpr());
     const MCInstrDesc &Desc = MCII.get(MI.getOpcode());
     uint32_t Offset = Desc.getSize();
     assert(Offset == 4 || Offset == 8);
-    addFixup(Fixups, Offset, MO.getExpr(), Kind, Kind == FK_PCRel_4);
+    addFixup(Fixups, Offset, MO.getExpr(), FK_Data_4, PCRel);
   }
 
   const MCInstrDesc &Desc = MCII.get(MI.getOpcode());