[SPARC] Fix PR gas/22738

[Eric Botcazou]

Hi,

the .dc.a directive has wrong size (32 bits) on SPARC 64-bit because the 
assembler sets the correct BFD architecture only at the very end of the 
processing and it's too late for the directive.  It's fixed by defining 
TARGET_MACH and making it return a sensible default value.

This was reported by H.J. very likely because of the failure of PR ld/22450 
and this indeed fixes the failure.  Tested on SPARC64/Linux, OK for mainline?


2018-01-25  Eric Botcazou  <ebotcazou@adacore.com>

gas/
	PR gas/22738
	* config/tc-sparc.h (sparc_mach): Declare.
	(TARGET_MACH): Define to above.
	* config/tc-sparc.c (sparc_mach): New function.
	(sparc_md_end): Minor tweak.


2018-01-25  Eric Botcazou  <ebotcazou@adacore.com>

ld/
	* testsuite/ld-elf/pr22450.d: Remove reference to SPARC64.

-- 
Eric Botcazou
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