Preserve alignment for Neon vld1_lane/dup and vst1_lane intrinsics.

We had been generating load/store instructions with the default alignment
for the vector element type, even when the pointer argument had less alignment.
<rdar://problem/10538555>

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@149794 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed