[clang] [clang] Reject array comparisons in C++26 for unknown/dependent types in templates (PR #191101)

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PrabbyDD wrote:

I am still trying to fix `array-compare-template.cpp`. Most of my `static_assert` clauses are firing, but i noticed the one for the `<=>` operator is passing. I am digging through `CheckCompareOperands()` to see why this is the case. But it seems to me that the array comparison is in the `requires` expressions are considered valid, which shouldn't happen. 

https://github.com/llvm/llvm-project/pull/191101