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Summary: Currently an error is thrown if bundle alignment mode is set more than once per module (either via the API or the .bundle_align_mode directive). This change allows setting it multiple times as long as the alignment doesn't change. Also nested bundle_lock groups are currently not allowed. This change allows them, with the effect that the group stays open until all nests are exited, and if any of the bundle_lock directives has the align_to_end flag, the group becomes align_to_end. These changes make the bundle aligment simpler to use in the compiler, and also better match the corresponding support in GNU as. Reviewers: jvoung, eliben Differential Revision: http://reviews.llvm.org/D5801 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@219811 91177308-0d34-0410-b5e6-96231b3b80d8
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