Intrinsics: fix extract & insert when index is out of bound.

Now, all extract & insert intrinsics should have the correct and operation
to ignore higher bits.

rdar://15250497


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@193267 91177308-0d34-0410-b5e6-96231b3b80d8