[RFA/gold] Patch to workaround ARM1176 BLX(immediate) Thumb to ARM issue

[Matthew Gretton-Dann]

All,

The attached patch adds the options --[no-]fix-arm1176 to Gold in a 
similar manner to that done to Ld earlier this year (see 
http://sourceware.org/ml/binutils/2011-07/msg00235.html).

When --fix-arm1176 is turned on (the default) ARM v5T interworking 
instructions are only available for ARM v6T2 and later architectures.

Further details on the erratum can be found on ARM's documentation website:
     http://infocenter.arm.com/
       User Assistance Notes
         ARM11 Processors
           ARM1176JZ-S and ARM1176JFZ-S Programmer Advice Note

This patch depends on my recently posted fixes to v4T/v5T interworking 
in gold (http://sourceware.org/ml/binutils/2011-09/msg00186.html).

Please can someone review.

Thanks,

Matt

gold/ChangeLog
2011-09-26  Matthew Gretton-Dann<matthew.gretton-dann@arm.com>

	* arm.cc (Target_arm::may_use_v5t_interworking): Check whether
	we are working around the ARM1176 Erratum.
	* options.h (General_options::fix_arm1176): Add option.
	* testsuite/Makefile.am: Add testcases, and keep current ones
	working.
	* testsuite/Makefile.in: Regenerate.
	* testsuite/arm_fix_1176.s: New file.
	* testsuite/arm_fix_1176.sh: Likewise.

-- 
Matthew Gretton-Dann
Principal Engineer, PD Software - Tools, ARM Ltd
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