Atmn Patel cea0599aa7 [LangRef] Adds llvm.loop.mustprogress loop metadata ...

This patch adds the llvm.loop.mustprogress loop metadata. This is to be
added to loops where the frontend language requires that the loop makes
observable interactions with the environment. This is the loop-level
equivalent to the function attribute `mustprogress` defined in D86233.

Reviewed By: jdoerfert

Differential Revision: https://reviews.llvm.org/D88464

2020-11-04 22:32:50 -05:00

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