[clang][OpenMP] Move "loop" directive mapping from sema to codegen (#99905) Given "loop" construct, clang will try to treat it as "for", "distribute" or "simd", depending on either the implied binding, or the bind clause if present. This patch moves the code that performs this construct remapping from sema to codegen. For a "loop" construct without a bind clause, this patch will create an implicit bind clause based on implied binding to simplify further analysis. During codegen the function `EmitOMPGenericLoopDirective` (i.e. "loop") will invoke the "emit" functions for "for", "distribute" or "simd", depending on the bind clause. --------- Co-authored-by: Alexey Bataev <a.bataev@gmx.com>
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