[ARM] Simplify ExpandPseudoInst. NFC.
[ARM] Simplify ExpandPseudoInst. NFC.

Remove headers not required and convert to range-loop

Reviewed by: @mcrosier
Differential Revision: https://reviews.llvm.org/D35626



git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@308607 91177308-0d34-0410-b5e6-96231b3b80d8

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