[Patch, microblaze]: Correct names of shift instructions

[David Holsgrove]

Existing MicroBlaze shift instruction pattern names don't match
surrounding format.

ashlri_reg should be ashrsi_reg - arithmetic shift right for SI mode
lshlri_reg should be lshrsi_reg - logical shift right for SI mode

Changelog

2013-11-26  David Holsgrove <david.holsgrove@xilinx.com>

 * gcc/config/microblaze/microblaze.md: Correct ashrsi_reg / lshrsi_reg names.
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