[llvm] [Mips] Add support for Mips::GPR64Idx in MipsRegisterBankInfo (PR #173534)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp,h -- llvm/lib/Target/Mips/MipsInstructionSelector.cpp llvm/lib/Target/Mips/MipsRegisterBankInfo.cpp llvm/lib/Target/Mips/MipsRegisterBankInfo.h --diff_from_common_commit
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``````````diff
diff --git a/llvm/lib/Target/Mips/MipsRegisterBankInfo.cpp b/llvm/lib/Target/Mips/MipsRegisterBankInfo.cpp
index d98e60d7b..7847cef5a 100644
--- a/llvm/lib/Target/Mips/MipsRegisterBankInfo.cpp
+++ b/llvm/lib/Target/Mips/MipsRegisterBankInfo.cpp
@@ -403,7 +403,7 @@ MipsRegisterBankInfo::getInstrMapping(const MachineInstr &MI) const {
   assert((GPRSize == 32 || GPRSize == 64) && "Unexpected GPR size");
   const ValueMapping *GPRValueMapping =
       GPRSize == 32 ? &Mips::ValueMappings[Mips::GPR32Idx]
-                      : &Mips::ValueMappings[Mips::GPR64Idx];
+                    : &Mips::ValueMappings[Mips::GPR64Idx];
   unsigned MappingID = DefaultMappingID;
 
   // Check if LLT sizes match sizes of available register banks.

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https://github.com/llvm/llvm-project/pull/173534