[llvm] Revert "[AMDGPU] Compiler should synthesize private buffer resource descriptor from flat_scratch_init" (PR #81234)

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``````````bash
git-clang-format --diff 2f8e37d20114ecb223caaa5a72e8b7c13daf9f34 426ef45b2e9ac5a9834adf8de2e77b6fa1b16de1 -- 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 d02aee7187..8fceb26da7 100644
--- a/llvm/lib/Target/AMDGPU/SIFrameLowering.cpp
+++ b/llvm/lib/Target/AMDGPU/SIFrameLowering.cpp
@@ -450,8 +450,8 @@ void SIFrameLowering::emitEntryFunctionFlatScratchInit(
     // Mask the offset in [47:0] of the descriptor
     const MCInstrDesc &SAndB32 = TII->get(AMDGPU::S_AND_B32);
     auto And = BuildMI(MBB, I, DL, SAndB32, FlatScrInitHi)
-        .addReg(FlatScrInitHi)
-        .addImm(0xffff);
+                   .addReg(FlatScrInitHi)
+                   .addImm(0xffff);
     And->getOperand(3).setIsDead(); // Mark SCC as dead.
   } else {
     Register FlatScratchInitReg =
@@ -491,8 +491,8 @@ void SIFrameLowering::emitEntryFunctionFlatScratchInit(
 
     // For GFX9.
     BuildMI(MBB, I, DL, TII->get(AMDGPU::S_ADD_U32), AMDGPU::FLAT_SCR_LO)
-      .addReg(FlatScrInitLo)
-      .addReg(ScratchWaveOffsetReg);
+        .addReg(FlatScrInitLo)
+        .addReg(ScratchWaveOffsetReg);
     auto Addc = BuildMI(MBB, I, DL, TII->get(AMDGPU::S_ADDC_U32),
                         AMDGPU::FLAT_SCR_HI)
       .addReg(FlatScrInitHi)

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https://github.com/llvm/llvm-project/pull/81234