[mips][ias] Fix O32 .cprestore directive when inside .set noat region and offset is in range.
Summary:
This expands on r269179 to fix an additional case that was not covered by our
tests. The assembler temporary is not needed when the .cprestore offset fits
inside a simm16 and it is not an error to use it inside a '.set noat' in this
case.
Reviewers: emaste, seanbruno, sdardis
Subscribers: dsanders, sdardis, llvm-commits
Differential Revision: http://reviews.llvm.org/D20199
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@269295
91177308-0d34-0410-b5e6-
96231b3b80d8
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