[CGP] add a reference to DataLayout in MemCmpExpansion; NFCI

We're currently passing endian-ness around as a param (and not uniformly),
so this eliminates the need for that. I'd like to add a constant fold
call too, and that requires a DL.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@305129 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed