[clang] [libcxx] [Clang] Add __builtin_invoke and use it in libc++ (PR #116709)

[Timm Baeder via cfe-commits]

================
@@ -4272,6 +4272,12 @@ def MoveIfNsoexcept : CxxLibBuiltin<"utility"> {
   let Namespace = "std";
 }
 
+def Invoke : Builtin {
+  let Spellings = ["__builtin_invoke"];
+  let Attributes = [CustomTypeChecking, Constexpr];
----------------
tbaederr wrote:

There are no changes to `ExprConstant.cpp` - is this actually tested in a 
constexpr context?

https://github.com/llvm/llvm-project/pull/116709
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