This commit moves the importing logic of access group metadata into the
loop annotation importer. These two metadata imports can be grouped
because access groups are only used in combination with
`llvm.loop.parallel_accesses`.
As a nice side effect, this commit decouples the LoopAnnotationImporter
from the ModuleImport class.
Differential Revision: https://reviews.llvm.org/D143577
This commit introduces functionality to import loop metadata. Loop
metadata nodes are transformed into LoopAnnotationAttrs and attached to
the corresponding branch operations.
Reviewed By: gysit
Differential Revision: https://reviews.llvm.org/D143376