[clang] nonblocking/nonallocating attributes (was: nolock/noalloc) (PR #84983)

[Aaron Ballman via cfe-commits]

================
@@ -1870,6 +1870,27 @@ bool Sema::IsFunctionConversion(QualType FromType, QualType ToType,
       FromFn = QT->getAs<FunctionType>();
       Changed = true;
     }
+
+    // For C, when called from checkPointerTypesForAssignment,
+    // we need not to alter FromFn, or else even an innocuous cast
----------------
AaronBallman wrote:

```suggestion
    // we need to not alter FromFn, or else even an innocuous cast
```

https://github.com/llvm/llvm-project/pull/84983