[RFC][GOLD] ARM: Add cantunwind when unwind info does not match start of section

[Yury Usishchev]

Hello!

Thanks for the explanation.

> +      if (first_word)
>
> When the condition is not a bool, I prefer using "!= 0".
Done.

BR,
Yury Usishchev

gold/
2016-02-11 Yury Usishchev <y.usishchev@samsung.com>

	PR gold/19611
	* arm.cc (fix_exidx_coverage): Insert cantunwind when address in
	first unwind entry does not match start of section.
	* testsuite/Makefile.am (arm_exidx_test.stdout): Add dump of unwind info
	* testsuite/Makefile.in: Regenerate
	* testsuite/arm_exidx_test.c: Add sections to test unwind info merging
	* testsuite/arm_exidx_test.sh: Add check for correct unwind info merging
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