Reapply with fixes for clang tests.
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This is a simple enum attribute. Test changes are because enum
attributes are sorted before type attributes, so mustprogress is
now in a different position.
Since C++11, the C++ standard has a forward progress guarantee
[intro.progress], so all such functions must have the `mustprogress`
requirement. In addition, from C11 and onwards, loops without a non-zero
constant conditional or no conditional are also required to make
progress (C11 6.8.5p6). This patch implements these attribute deductions
so they can be used by the optimization passes.
Differential Revision: https://reviews.llvm.org/D86841
Summary:
This introduces new flag to the update_test_checks and
update_cc_test_checks that allows for function attributes
to be checked in a check-line. If the flag is not set,
the behavior should remain the same.
Reviewers: jdoerfert
Subscribers: arichardson, llvm-commits
Tags: #llvm
Differential Revision: https://reviews.llvm.org/D83629
Nikita Popov