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Reapply [BranchFolding] Restrict tail merging loop blocks after MBP

Authored by haicheng on Aug 12 2016, 4:13 PM.

Description

Reapply [BranchFolding] Restrict tail merging loop blocks after MBP

Fixed a bug in the test case.

To fix PR28104, this patch restricts tail merging to blocks that belong to the
same loop after MBP.

llvm-svn: 278575

Details

Committed
haichengAug 12 2016, 4:13 PM
Parents
rG2868fa171a35: Avoid accessing LLVM/DWARF register mappings if undefined
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