[clang] [AST] Use explicit type erasure in TypeSourceInfo constructor (PR #68435)

[via cfe-commits]

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@@ -243,7 +243,7 @@ class TypeLoc {
 
 inline TypeSourceInfo::TypeSourceInfo(QualType ty, size_t DataSize) : Ty(ty) {
   // Init data attached to the object. See getTypeLoc.
-  memset(this + 1, 0, DataSize);
+  memset(const_cast<void *>(static_cast<const void *>(this + 1)), 0, DataSize);
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bonktree wrote:

My intention here was to match the double cast in `::getTypeLoc()`, so the way this memory is referenced is the same throughout the impls.

I've just tested the single cast, and it does not trigger the warning as well. Will amend my patch then.

https://github.com/llvm/llvm-project/pull/68435