Make user of early-stop in CanMergeWithoutConflict
Make user of early-stop in CanMergeWithoutConflict

This stops at the first error so we can return negatives quicker.

libgit2/libgit2sharp,PKRoma/libgit2sharp,Zoxive/libgit2sharp,red-gate/libgit2sharp,Zoxive/libgit2sharp,red-gate/libgit2sharp