[clang] [ClangFE] Improve handling of casting of atomic memory operations. (PR #86691)

[Jonas Paulsson via cfe-commits]

================
@@ -1399,13 +1401,22 @@ RValue AtomicInfo::convertAtomicTempToRValue(Address 
addr,
       LVal.getBaseInfo(), TBAAAccessInfo()));
 }
 
+static bool shouldCastToInt(llvm::Type *ValTy, bool CmpXchg) {
----------------
JonPsson1 wrote:

I thought it was a bit more clear than 'CastFP', as the reason for it now is 
the compare-and-exchange instruction only.
Also added comment.

https://github.com/llvm/llvm-project/pull/86691
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