[clang] Implement [[msvc::no_unique_address]] (PR #65675)

[Reid Kleckner via cfe-commits]

================
@@ -3055,7 +3195,7 @@ void MicrosoftRecordLayoutBuilder::injectVBPtr(const 
CXXRecordDecl *RD) {
     // It is possible that there were no fields or bases located after vbptr,
     // so the size was not adjusted before.
     if (Size < FieldStart)
-      Size = FieldStart;
+      DataSize = Size = FieldStart;
----------------
rnk wrote:

If we need to track DataSize, should we create an abstraction for updating both 
members?

https://github.com/llvm/llvm-project/pull/65675
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