[llvm] [AMDGPU] Compiler should synthesize private buffer resource descriptor from flat_scratch_init (PR #79586)

[Matt Arsenault via llvm-commits]

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@@ -398,6 +398,7 @@ void SIFrameLowering::emitEntryFunctionFlatScratchInit(
 
   Register FlatScrInitLo;
   Register FlatScrInitHi;
+  Register FlatScratchInitReg = AMDGPU::NoRegister;
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arsenm wrote:

Initialization is unnecessary 

https://github.com/llvm/llvm-project/pull/79586