[mips] Move ABI-dependent register selections to MipsABIInfo. NFC.
Summary:
For example, a common idiom was 'isN64 ? Mips::SP_64 : Mips::SP'. This has
been moved to MipsABIInfo and replaced with 'ABI.GetStackPtr()'.
There are others that should also be moved. This patch sticks to the ones that
are obviously non-functional. The others have minor mistakes that need fixing
at the same time, mostly involving checks for 64-bit GPR's instead of checks
for 64-bit pointers.
Reviewers: tomatabacu
Reviewed By: tomatabacu
Subscribers: llvm-commits
Differential Revision: http://reviews.llvm.org/D8972
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@235173
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