llvm-project

afd1ffb4 - [mlir][acc] Check legality of symbols in acc regions (#167957)

[mlir][acc] Check legality of symbols in acc regions (#167957) This PR adds a new utility function to check whether symbols used in OpenACC regions are legal for offloading. Functions must be marked with `acc routine` or be built-in intrinsics. Global symbols must be marked with `acc declare`. The utility is designed to be extensible, and the OpenACCSupport analysis has been updated to allow handling of additional symbols that do not necessarily use OpenACC attributes but are marked in a way that still guarantees the symbol will be available when offloading. For example, in the Flang implementation, CUF attributes can be validated as legal symbols.