[mips] [IAS] Add support for generating DADDu to createAddu(). NFC.
[mips] [IAS] Add support for generating DADDu to createAddu(). NFC.

Summary: This isn't used right now, but it will be in some upcoming changes.

Reviewers: dsanders

Reviewed By: dsanders

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D10568

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@240407 91177308-0d34-0410-b5e6-96231b3b80d8

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