[clang] [clang][bytecode] Apply pointer casts to opaque pointers (PR #223607)

[Oliver Hunt via cfe-commits]

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@@ -474,3 +474,15 @@ void AddrLabelDiffSub(void) {
                                                              // all-error {{use of undeclared label 'baz'}} \
                                                              // pedantic-warning 2{{use of GNU address-of-label extension}}
 }
+
+void *memset(void*, int, unsigned long);
+typedef struct Parse Parse;
+struct Parse {
+  int aTempReg;
+  int sLastToken;
+};
+
+Parse sqlite3Prepare_sParse;
+void sqlite3Prepare(void) {
+  memset( ((char *)&sqlite3Prepare_sParse) + sizeof(int), 0, sizeof(int));
+}
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ojhunt wrote:

to avoid ambiguity in the test can we include an addition case with `sizeof(X)` where `X` the field types in the parent type are not `X`?

https://github.com/llvm/llvm-project/pull/223607