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[MIPS MSA] Avoid some DAG combines for vector shifts

Description

[MIPS MSA] Avoid some DAG combines for vector shifts

DAG combiner combines two shifts into shift + and with bitmask.
Avoid such combines for vectors since leaving two vector shifts
as they are produces better end results.

Differential Revision: https://reviews.llvm.org/D58225

Details

Committed
Petar.AvramovicFeb 20 2019, 5:42 AM
Differential Revision
D58225: [MIPS MSA] Avoid some DAG combines for vector shifts
Parents
rL354460: Merging r354402:
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