[RISCV][NFC] Replace reportError wrappers with direct reportFatalUsageError calls (llvm#148142)

Remove the unnecessary reportError wrapper functions and call
reportFatalUsageError directly.

Author: nosba0957

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

@@ -52,15 +52,6 @@ namespace RISCV {
 #include "RISCVGenSearchableTables.inc"
 } // namespace RISCV
 
-// Report an error but don't ask the user to report a bug.
-// TODO: Remove these wrappers.
-[[noreturn]] static void reportError(const char *Reason) {
-  reportFatalUsageError(Reason);
-}
-[[noreturn]] static void reportError(Error Err) {
-  reportFatalUsageError(std::move(Err));
-}
-
 namespace RISCVABI {
 ABI computeTargetABI(const Triple &TT, const FeatureBitset &FeatureBits,
                      StringRef ABIName) {
@@ -97,15 +88,15 @@ ABI computeTargetABI(const Triple &TT, const FeatureBitset &FeatureBits,
   if ((TargetABI == RISCVABI::ABI::ABI_ILP32E ||
        (TargetABI == ABI_Unknown && IsRVE && !IsRV64)) &&
       FeatureBits[RISCV::FeatureStdExtD])
-    reportError("ILP32E cannot be used with the D ISA extension");
+    reportFatalUsageError("ILP32E cannot be used with the D ISA extension");
 
   if (TargetABI != ABI_Unknown)
     return TargetABI;
 
   // If no explicit ABI is given, try to compute the default ABI.
   auto ISAInfo = RISCVFeatures::parseFeatureBits(IsRV64, FeatureBits);
   if (!ISAInfo)
-    reportError(ISAInfo.takeError());
+    reportFatalUsageError(ISAInfo.takeError());
   return getTargetABI((*ISAInfo)->computeDefaultABI());
 }
 
@@ -137,12 +128,12 @@ namespace RISCVFeatures {
 
 void validate(const Triple &TT, const FeatureBitset &FeatureBits) {
   if (TT.isArch64Bit() && !FeatureBits[RISCV::Feature64Bit])
-    reportError("RV64 target requires an RV64 CPU");
+    reportFatalUsageError("RV64 target requires an RV64 CPU");
   if (!TT.isArch64Bit() && !FeatureBits[RISCV::Feature32Bit])
-    reportError("RV32 target requires an RV32 CPU");
+    reportFatalUsageError("RV32 target requires an RV32 CPU");
   if (FeatureBits[RISCV::Feature32Bit] &&
       FeatureBits[RISCV::Feature64Bit])
-    reportError("RV32 and RV64 can't be combined");
+    reportFatalUsageError("RV32 and RV64 can't be combined");
 }
 
 llvm::Expected<std::unique_ptr<RISCVISAInfo>>