Fix address calculation error from r155744.

This was exposed by SingleSource/UnitTests/Vector/constpool.c.

The computed size of a basic block isn't always a multiple of its known
alignment, and that can introduce extra alignment padding after the
block.

<rdar://problem/11347135>

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@155845 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed