Javed Absar 3d59437093 Improve machine schedulers for in-order processors ...

This patch enables schedulers to specify instructions that 
cannot be issued with any other instructions.
It also fixes BeginGroup/EndGroup.

Reviewed by: Andrew Trick
Differential Revision: https://reviews.llvm.org/D30744

llvm-svn: 298885

2017-03-27 20:46:37 +00:00

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