Related to r181161 - Indirect branches may not be the last branch in a basic
block. Blocks that have an indirect branch terminator, even if it's not the
last terminator, should still be treated as unanalyzable.

<rdar://problem/14437274>

Reducing a useful regression test case is proving difficult - I hope to have
one soon.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@186461 91177308-0d34-0410-b5e6-96231b3b80d8
SLPVectorizer: Improve the compile time of isConsecutive by adding a simple constant-gep check before using SCEV.
This check does not always work because not all of the GEPs use a constant offset, but it happens often enough to reduce the number of times we use SCEV.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@186465 91177308-0d34-0410-b5e6-96231b3b80d8
flip the scev minus direction to simplify the code.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@186466 91177308-0d34-0410-b5e6-96231b3b80d8