[mips] Fix ehframe-indirect.ll test.
[mips] Fix ehframe-indirect.ll test.

Summary:
-check-prefix replaces the default CHECK prefix rather than adding to it and
must be explicitly re-added.

Also added the N32 cases.

Reviewers: petarj

Reviewed By: petarj

Subscribers: tberghammer, llvm-commits

Differential Revision: http://reviews.llvm.org/D9668

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@237790 91177308-0d34-0410-b5e6-96231b3b80d8

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