[clang] [llvm] [AMDGPU] Fix out-of-bounds read of a trailing '%' in printf formats (PR #229088)

[Steffen Larsen via cfe-commits]

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@@ -187,7 +187,7 @@ static void locateCStrings(SparseBitVector<8> &BV, 
StringRef Str) {
   unsigned ArgIdx = 1;
 
   while ((SpecPos = Str.find_first_of('%', SpecPos)) != StringRef::npos) {
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steffenlarsen wrote:

I'll have a look at this for a separate patch.

https://github.com/llvm/llvm-project/pull/229088
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