[llvm] Update amdgpu_gfx functions to use s0-s3 for inreg SGPR arguments on targets using scratch instructions for stack (PR #78844)

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git-clang-format --diff 58d5a486ec641156dcf420d67e075dc0a766fc5e b13ea613948eb4bd1c52baf552720bfc3cdc2b6b -- llvm/lib/Target/AMDGPU/AMDGPUCallLowering.cpp llvm/lib/Target/AMDGPU/SIISelLowering.cpp
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View the diff from clang-format here.
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``````````diff
diff --git a/llvm/lib/Target/AMDGPU/AMDGPUCallLowering.cpp b/llvm/lib/Target/AMDGPU/AMDGPUCallLowering.cpp
index 0cd1d47a9b..292d7ed74d 100644
--- a/llvm/lib/Target/AMDGPU/AMDGPUCallLowering.cpp
+++ b/llvm/lib/Target/AMDGPU/AMDGPUCallLowering.cpp
@@ -733,7 +733,7 @@ bool AMDGPUCallLowering::lowerFormalArguments(
   } else {
     if (!Subtarget.enableFlatScratch())
       CCInfo.AllocateReg(Info->getScratchRSrcReg());
-    if(!IsGraphics)
+    if (!IsGraphics)
       TLI.allocateSpecialInputSGPRs(CCInfo, MF, *TRI, *Info);
   }
   // When we tail call, we need to check if the callee's arguments will fit on
diff --git a/llvm/lib/Target/AMDGPU/SIISelLowering.cpp b/llvm/lib/Target/AMDGPU/SIISelLowering.cpp
index 38beae95aa..8eb0d05615 100644
--- a/llvm/lib/Target/AMDGPU/SIISelLowering.cpp
+++ b/llvm/lib/Target/AMDGPU/SIISelLowering.cpp
@@ -2992,7 +2992,7 @@ SDValue SITargetLowering::LowerFormalArguments(
   } else {
     if (!Subtarget->enableFlatScratch())
       CCInfo.AllocateReg(Info->getScratchRSrcReg());
-    if(!IsGraphics)
+    if (!IsGraphics)
       allocateSpecialInputSGPRs(CCInfo, MF, *TRI, *Info);
   }
 

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https://github.com/llvm/llvm-project/pull/78844