[Flang][OpenMP] Push context when parsing DECLARE VARIANT (#147075) Basic parsing and semantics support for Declare Variant was added in #130578. However, this did not include variant of `Pre` and `Post` within `OmpAttributeVisitor`. This meant that when a function in the class tried to get the context using `GetContext`, Flang would crash as the context was empty. To ensure this is possible, such as when resolving names as part of the `uniform` clause in the `simd` directive, the context is now pushed within `OmpAttributeVisitor` when parsing a `DECLARE VARIANT` directive. Fixes #145222
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