[clang] [Clang] Fix mangling of parenthesized aggregate initialization (PR #232357)

[Kunal Dubey via cfe-commits]

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@@ -5770,7 +5773,17 @@ void CXXNameMangler::mangleExpression(const Expr *E, unsigned Arity,
         Sub = CCE->getArg(0)->IgnoreImplicit();
     if (auto *StdInitList = dyn_cast<CXXStdInitializerListExpr>(Sub))
       Sub = StdInitList->getSubExpr()->IgnoreImplicit();
-    if (auto *IL = dyn_cast<InitListExpr>(Sub)) {
+    if (auto *PLIE = dyn_cast<CXXParenListInitExpr>(Sub)) {
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xakep8 wrote:

Good catch. I moved the single-operand parenthesized-initializer handling into the common cast-mangling path and added tests for both the C-style and static_cast forms. Their manglings also match GCC: https://godbolt.org/z/xWPcnr3K6

https://github.com/llvm/llvm-project/pull/232357