[Patch, AArch64, 5/5] backport recent fixes to 2.23 - fix sysreg diagnostics

[Yufeng Zhang]

This patch fixes the incorrect diagnostics on illegal system registers. 
  It was committed to the trunk at:

http://sourceware.org/ml/binutils-cvs/2013-01/msg00048.html

OK for 2_23-branch?

Thanks,
Yufeng

gas/

	* config/tc-aarch64.c (parse_operands): Change to compare the result
	of function call 'parse_sys_reg' with 'PARSE_FAIL' instead of 'FALSE'.

gas/testsuite/

	* gas/aarch64/diagnostic.s: Add test.
	* gas/aarch64/diagnostic.l: Update.
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