[llvm] [AMDGPU] Add flag to force emit s_nop (PR #117839)

[Jay Foad via llvm-commits]

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@@ -49,6 +49,11 @@ static cl::opt<unsigned> MaxExhaustiveHazardSearch(
     "amdgpu-max-exhaustive-hazard-search", cl::init(128), cl::Hidden,
     cl::desc("Maximum function size for exhausive hazard search"));
 
+static cl::opt<unsigned, false, PaddingRatioParser>
+    NopPadding("amdgpu-snop-padding", cl::Hidden,
+               cl::desc("Insert a s_nop between every instruction for a given "
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jayfoad wrote:

More accurate to say _before_ every instruction

https://github.com/llvm/llvm-project/pull/117839