[flang][OpenMP] Avoid analyzing assumed-size array bases (#150324) A check for character substrings masquerading as array sections was using expression analyzer on the array base. When this array happened to be an assumed-size array, the analyzer emitted a semantic error that did not correspond to any issue with the source code. To avoid that, check whether the object is an assumed-size array before using the expression analyzer on it. While at it, replace the call to GetShape with a simple check for rank, since that's the only information needed. Fixes https://github.com/llvm/llvm-project/issues/150297
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