Don't make changes to the MBB in MachineBasicBlock::canFallThrough().

This fixes the regression for -pre-regalloc-taildup in
MultiSource/Applications/lambda-0.1.3.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@93541 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed