[clang] [Sema] Add check for bitfield assignments to larger integral types (PR #68276)

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@@ -0,0 +1,36 @@
+// RUN: %clang_cc1 -Wconversion -fsyntax-only -verify %s
+
+typedef struct _xx {
+     int bf:9; // expected-note{{widen this field to 32 bits to store all values of 'int'}}
+     // expected-note at -1{{widen this field to 16 bits to store all values of 'short'}}
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vabridgers wrote:

Thanks @erichkeane, I'll iterate on improving the note. 

https://github.com/llvm/llvm-project/pull/68276