[RISCV] Remove fixup_riscv_pcrel_hi20 from evaluateTargetFixup. NFC

It can be handled by the target-neutral code path in MCAssembler::evaluateFixup.

Author: MaskRay

llvm/lib/Target/RISCV/MCTargetDesc/RISCVAsmBackend.cpp

@@ -71,8 +71,7 @@ MCFixupKindInfo RISCVAsmBackend::getFixupKindInfo(MCFixupKind Kind) const {
       {"fixup_riscv_lo12_i", 20, 12, 0},
       {"fixup_riscv_12_i", 20, 12, 0},
       {"fixup_riscv_lo12_s", 0, 32, 0},
-      {"fixup_riscv_pcrel_hi20", 12, 20,
-       MCFixupKindInfo::FKF_IsPCRel | MCFixupKindInfo::FKF_IsTarget},
+      {"fixup_riscv_pcrel_hi20", 12, 20, MCFixupKindInfo::FKF_IsPCRel},
       {"fixup_riscv_pcrel_lo12_i", 20, 12,
        MCFixupKindInfo::FKF_IsPCRel | MCFixupKindInfo::FKF_IsTarget},
       {"fixup_riscv_pcrel_lo12_s", 0, 32,
@@ -580,11 +579,6 @@ bool RISCVAsmBackend::evaluateTargetFixup(
   switch (Fixup.getTargetKind()) {
   default:
     llvm_unreachable("Unexpected fixup kind!");
-  case RISCV::fixup_riscv_pcrel_hi20:
-    AUIPCFixup = &Fixup;
-    AUIPCDF = DF;
-    AUIPCTarget = Target;
-    break;
   case RISCV::fixup_riscv_pcrel_lo12_i:
   case RISCV::fixup_riscv_pcrel_lo12_s: {
     AUIPCFixup = cast<RISCVMCExpr>(Fixup.getValue())->getPCRelHiFixup(&AUIPCDF);