Merging r259039:

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r259039 | zjovanovic | 2016-01-28 11:08:03 +0000 (Thu, 28 Jan 2016) | 9 lines

[mips][microMIPS] Disable FastISel for microMIPS

Author: milena.vujosevic.janicic
Reviewers: dsanders

FastIsel is not supported for microMIPS, thus it needs to be disabled. 
Test micromips-zero-mat-uses.ll is deleted since the tested sequence of instructions is not generated for microMIPS without FastISel.
Differential Revision: http://reviews.llvm.org/D15892

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llvm-svn: 271122