Revert r145273 and fix in SelectionDAG::InferPtrAlignment() instead.
Conservatively returns zero when the GV does not specify an alignment nor is it
initialized. Previously it returns ABI alignment for type of the GV. However, if
the type is a "packed" type, then the under-specified alignments is attached to
the load / store instructions. In that case, the alignment of the type cannot be
trusted.
rdar://
10464621
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@145300
91177308-0d34-0410-b5e6-
96231b3b80d8