ADT: Move ArrayRef comparison operators into the class

Summary:
This allows the implicit ArrayRef conversions to kick in when e.g.
comparing ArrayRef to a SmallVector.

Reviewers: zturner, dblaikie

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D48632

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@335839 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed