[clang] [C23] Fixed the value of BOOL_WIDTH (PR #117364)

[Jens Gustedt via cfe-commits]

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@@ -1103,7 +1103,15 @@ static void InitializePredefinedMacros(const TargetInfo &TI,
   assert(TI.getCharWidth() == 8 && "Only support 8-bit char so far");
   Builder.defineMacro("__CHAR_BIT__", Twine(TI.getCharWidth()));
 
-  Builder.defineMacro("__BOOL_WIDTH__", Twine(TI.getBoolWidth()));
+  // The macro is specifying the number of bits in the value representation,
+  // not the number of bits in the object representation, which is what
+  // getBoolWidth() will return. For the bool/_Bool data type, there is only
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gustedt wrote:

Yes, on modern architectures, `bool` and `_BitInt` should be the only integer types that have padding bits.

https://github.com/llvm/llvm-project/pull/117364