[LowerSwitch] Skip dead blocks for processSwitchInst()

Summary: This patch adds check for dead blocks and skip them for processSwitchInst(). This will help reduce compilation time.

Reviewers: reames, hans

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D11953

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@244656 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed