[PATCH][ARM] Tests for arm_restrict_it patterns in thumb2.md

[Kyrill Tkachov]

Hi all,

I've been auditing the patterns in the arm backend that were added/modified for -mrestrict-it
and I've come up with a few runtime tests that end up generating those patterns.
This patch contains 4 tests for 4 patterns that have paths specific to -mrestrict-it.

There were some patterns like thumb2_mov_negscc_strict_it and thumb2_mov_notscc_strict_it
that I could not generate at all, because the earlier RTL optimisers always generated some
equivalent but different (and at least as good) so these splitters never matched.
I think we could safely remove them, but not at this stage.

These tests should give us a bit more test coverage into the -mrestrict-it functionality.

Ok for trunk?

Thanks,
Kyrill

2016-02-05  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>

     * gcc.target/arm/cond_sub_restrict_it.c: New test.
     * gcc.target/arm/condarith_restrict_it.c: Likewise.
     * gcc.target/arm/movcond_restrict_it.c: Likewise.
     * gcc.target/arm/negscc_restrict_it.c: Likewise.
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