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

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``````````bash
git-clang-format --diff 3a31cf88538ed5282fce5408a48e48265e019ca6 cbecf53314c6d969d6590a62edcf651718a73105 -- llvm/lib/Target/AMDGPU/SIFrameLowering.cpp llvm/lib/Target/AMDGPU/SIFrameLowering.h
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View the diff from clang-format here.
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``````````diff
diff --git a/llvm/lib/Target/AMDGPU/SIFrameLowering.cpp b/llvm/lib/Target/AMDGPU/SIFrameLowering.cpp
index 4842cf83af..63c7c05e68 100644
--- a/llvm/lib/Target/AMDGPU/SIFrameLowering.cpp
+++ b/llvm/lib/Target/AMDGPU/SIFrameLowering.cpp
@@ -421,7 +421,8 @@ Register SIFrameLowering::emitEntryFunctionFlatScratchInit(
         break;
       }
     }
-    assert(FlatScratchInitReg && "Failed to find free register for scratch init");
+    assert(FlatScratchInitReg &&
+           "Failed to find free register for scratch init");
 
     FlatScrInitLo = TRI->getSubReg(FlatScratchInitReg, AMDGPU::sub0);
     FlatScrInitHi = TRI->getSubReg(FlatScratchInitReg, AMDGPU::sub1);
@@ -702,7 +703,6 @@ void SIFrameLowering::emitEntryFunctionPrologue(MachineFunction &MF,
     BuildMI(MBB, I, DL, TII->get(AMDGPU::S_MOV_B32), FPReg).addImm(0);
   }
 
-
   if ((NeedsFlatScratchInit || ScratchRsrcReg) &&
       PreloadedScratchWaveOffsetReg && !ST.flatScratchIsArchitected()) {
     MRI.addLiveIn(PreloadedScratchWaveOffsetReg);

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