[mips] [IAS] Inline assemble-time shifting out of createLShiftOri. NFC.
[mips] [IAS] Inline assemble-time shifting out of createLShiftOri. NFC.

Summary:
Do the assemble-time shifts from createLShiftOri at the source, which groups all the shifting together, closer to the main logic path, and
store the results in concisely-named variables to improve code clarity.

Reviewers: dsanders

Reviewed By: dsanders

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D8973

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@236096 91177308-0d34-0410-b5e6-96231b3b80d8

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