[llvm] [SPIRV] Add FPVariant tracking for floating-point registers in SPIR-V (PR #156871)

[via llvm-commits]

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@@ -2088,3 +2100,21 @@ bool SPIRVGlobalRegistry::hasBlockDecoration(SPIRVType *Type) const {
   }
   return false;
 }
+
+SPIRVGlobalRegistry::FPVariant
+SPIRVGlobalRegistry::getFPVariantForVReg(Register VReg,
+                                         const MachineFunction *MF) {
+  const MachineFunction *Func = MF ? MF : CurMF;
+  DenseMap<const MachineFunction *,
+           DenseMap<Register, FPVariant>>::const_iterator FuncIt =
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YixingZhang007 wrote:

Yeah, I agree `auto` might be a better choice here. I’ve updated both iterator types to use `auto`. Thanks for the suggestion :)

https://github.com/llvm/llvm-project/pull/156871