[clang] [clang] Fix parenthesized list initialization of arrays not working with `new` (PR #76976)

[Alan Zhao via cfe-commits]

================
@@ -1038,11 +1038,14 @@ void CodeGenFunction::EmitNewArrayInitializer(
     return true;
   };
 
+  const InitListExpr *ILE = dyn_cast<InitListExpr>(Init);
+  const CXXParenListInitExpr *CPLIE = dyn_cast<CXXParenListInitExpr>(Init);
+  const StringLiteral *SL = dyn_cast<StringLiteral>(Init);
   // If the initializer is an initializer list, first do the explicit elements.
-  if (const InitListExpr *ILE = dyn_cast<InitListExpr>(Init)) {
+  if (ILE || CPLIE || SL) {
----------------
alanzhao1 wrote:

This is parsed as a `StringLiteral` as shown in the AST.

`new-array.cc`:

```cpp
char* x = new char[]("asdf");
```

```
$ ./bin/clang -Xclang -ast-dump -std=c++20 ~/src/tests/new-array.cc

(irrelevant bits omitted)

|-VarDecl 0x557ce6fee8c0 </usr/local/google/home/ayzhao/src/tests/new-array.cc:1:1, col:28> col:7 x 'char *' cinit
| `-CXXNewExpr 0x557ce700cca0 <col:11, col:28> 'char *' array Function 0x557ce6fef0a0 'operator new[]' 'void *(unsigned long)'
|   |-IntegerLiteral 0x557ce700cc50 <col:15> 'unsigned long' 5
|   `-StringLiteral 0x557ce6feea00 <col:22> 'char[5]' "asdf"
```

https://github.com/llvm/llvm-project/pull/76976