[HSA] Enhancement of back-end

[Martin Liška]

Hello.

Following patch set enhances back-end, it adds support for SBR instructions and
it fixed many issues spotted in GCC's test suite. Patches have been just applied
to HSA branch:

a73d92c HSA: add support for SBR instruction.
6485fbf HSA: fix issues in GIMPLE switch expansion.
b73698c HSA: fix an HSA predicate.
df466a1 HSA: fix ICE in compilation of a vector test.
1b2c8f0 HSA: add support for empty ctors.
6702754 HSA: fix mem{cpy,set}
0bf687e HSA: fix rotate expansion with a constant first argument.
8c7999d HSA: fix emission of atomic insns.
7c7c57a HSA: sorry in case of complex recursive edges presented in CFG.
b79576f HSA: add seen_error guard to assignment emission.
7808c7e HSA: handle CTORs and verify function arguments.

Thanks,
Martin
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