[llvm] [RISCV] Re-implement Zacas MC layer support to make it usable for CodeGen. (PR #77418)

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git-clang-format --diff 7ab64b3266c580f946b3b65992030c3f68cbe392 3e66ca38de48064dfaaf16686f722ab401291504 -- llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp llvm/lib/Target/RISCV/Disassembler/RISCVDisassembler.cpp llvm/lib/Target/RISCV/RISCVExpandPseudoInsts.cpp llvm/lib/Target/RISCV/RISCVISelLowering.cpp llvm/lib/Target/RISCV/RISCVInstrInfo.cpp
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diff --git a/llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp b/llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp
index 3bc7638db1..7d42481db5 100644
--- a/llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp
+++ b/llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp
@@ -199,8 +199,7 @@ class RISCVAsmParser : public MCTargetAsmParser {
   ParseStatus parseInsnDirectiveOpcode(OperandVector &Operands);
   ParseStatus parseInsnCDirectiveOpcode(OperandVector &Operands);
   ParseStatus parseGPRAsFPR(OperandVector &Operands);
-  template <bool IsRV64Inst>
-  ParseStatus parseGPRPair(OperandVector &Operands);
+  template <bool IsRV64Inst> ParseStatus parseGPRPair(OperandVector &Operands);
   ParseStatus parseGPRPair(OperandVector &Operands, bool IsRV64Inst);
   ParseStatus parseFRMArg(OperandVector &Operands);
   ParseStatus parseFenceArg(OperandVector &Operands);
@@ -471,7 +470,8 @@ public:
 
   bool isGPRPair() const {
     return Kind == KindTy::Register &&
-           RISCVMCRegisterClasses[RISCV::GPRPairRegClassID].contains(Reg.RegNum);
+           RISCVMCRegisterClasses[RISCV::GPRPairRegClassID].contains(
+               Reg.RegNum);
   }
 
   static bool evaluateConstantImm(const MCExpr *Expr, int64_t &Imm,
@@ -2269,8 +2269,9 @@ ParseStatus RISCVAsmParser::parseGPRPair(OperandVector &Operands,
   getLexer().Lex();
 
   const MCRegisterInfo *RI = getContext().getRegisterInfo();
-  unsigned Pair = RI->getMatchingSuperReg(RegNo, RISCV::sub_gpr_even,
-                                          &RISCVMCRegisterClasses[RISCV::GPRPairRegClassID]);
+  unsigned Pair = RI->getMatchingSuperReg(
+      RegNo, RISCV::sub_gpr_even,
+      &RISCVMCRegisterClasses[RISCV::GPRPairRegClassID]);
   Operands.push_back(RISCVOperand::createReg(Pair, S, E));
   return ParseStatus::Success;
 }

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https://github.com/llvm/llvm-project/pull/77418