Michael Kuperstein d99a2e3ae2 [DAG] Improve legalization of INSERT_SUBVECTOR
When the index is known to be constant 0, insert directly into the the low half,
instead of spilling, performing the insert in-memory, and reloading.

Differential Revision: http://reviews.llvm.org/D20763


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@271428 91177308-0d34-0410-b5e6-96231b3b80d8
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