Tom Eccles f84070b2b0 [flang][OpenMP] move omp end sections validation to semantics
See #90452. The old parse tree errors exploded to thousands of unhelpful
lines when there were multiple missing end directives.

Instead, allow a missing end directive in the parse tree then validate
that it is present during semantics (where the error messages are a lot
easier to control).
2025-08-21 15:51:10 +00:00
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