[Triple] Reimplement isLittleEndian(). Now it works for arm too.

Differential Revision:   http://reviews.llvm.org/D21846

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@274154 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed