The special-casing for RequiresExprBodyDecl caused a regression, as
reported in #110785.
The original fix for #84020 has been superseded by fd87d765c0, which
establishes a `DependentScopeDeclRefExpr` instead of a
`CXXDependentScopeMemberExpr` for the case in issue. So the spurious
diagnostic in #84020 would no longer occur.
This also merges the test for #84020 together with that for #110785 into
clang/test/SemaTemplate/instantiate-requires-expr.cpp.
No release note because I think this merits a backport.
Fixes #110785
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