[mips] Small update to the logic behind the expansion of assembly pseudo instructions.
[mips] Small update to the logic behind the expansion of assembly pseudo instructions.

Summary:
The functions that do the expansion now return false on success and true otherwise. This is so
we can catch some errors during the expansion (e.g.: immediate too large). The next patch adds some test cases.

Reviewers: vmedic

Reviewed By: vmedic

Differential Revision: http://reviews.llvm.org/D4214

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@211269 91177308-0d34-0410-b5e6-96231b3b80d8

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