[LLE] Check for mismatching types between the store and the load earlier

isDependenceDistanceOfOne asserts that the store and the load access
through the same type.  This function is also used by
removeDependencesFromMultipleStores so we need to make sure we filter
out mismatching types before reaching this point.

Now we do this when the initial candidates are gathered.

This is a refinement of the fix made in r262267.

Fixes PR27048.

llvm-svn: 264313