[ARM] Cleanup of smul and smla instruction descriptions
[ARM] Cleanup of smul and smla instruction descriptions

Removed the SDNode argument passed to the AI_smul and AI_smla multiclass
definitions as they are always mul.

Differential Revision: http://reviews.llvm.org/D18791



git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@265409 91177308-0d34-0410-b5e6-96231b3b80d8

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