[clang] [llvm] [AMDGPU] Extend readlane, writelane and readfirstlane intrinsic lowering for generic types (PR #89217)

[Matt Arsenault via cfe-commits]

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@@ -5461,8 +5461,7 @@ bool AMDGPULegalizerInfo::legalizeLaneOp(LegalizerHelper &Helper,
 
   SmallVector<Register, 2> PartialRes;
   unsigned NumParts = Size / 32;
-  MachineInstrBuilder Src0Parts, Src2Parts;
-  Src0Parts = B.buildUnmerge(PartialResTy, Src0);
+  MachineInstrBuilder Src0Parts = B.buildUnmerge(PartialResTy, Src0), Src2Parts;
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arsenm wrote:

Don't also declare Src2Parts on the same line 

https://github.com/llvm/llvm-project/pull/89217