[clang] [Clang] fix static operator()/[] call not evaluating object (PR #78356)

[Mital Ashok via cfe-commits]

MitalAshok wrote:

This pull request changes `E(...)` to produce the same AST as `E.operator()(...)`, which is similar to `E.f(...)` for a static member function `f`.

But the linked #68485 changes this to CXXOperatorCallExpr, which is more appropriate since it is used for non-member call operators like anyways

https://github.com/llvm/llvm-project/pull/78356