C PATCH for c/65345 (file-scope _Atomic expansion with floats)

[Eric Botcazou]

> Joseph reminded me that I had forgotten about this patch.  As mentioned
> here <https://gcc.gnu.org/ml/gcc-patches/2015-04/msg01792.html>, I'm
> removing the XFAILs in the tests so people are likely to see new FAILs.
> 
> I think the following targets will need similar fix as the one below:
> * MIPS
> * rs6000
> * alpha
> * sparc
> * s390
> * arm
> * sh
> * aarch64
> 
> I'm CCing the respective maintainers.  You might want to XFAIL those tests.

Thanks, here are the SPARC bits with an explanation for the other maintainers: 
create_tmp_var_raw must be used instead of create_tmp_var because the hook can 
be invoked outside of a function context; likewise for TREE_ADDRESSABLE vs 
mark_addressable; TARGET_EXPR is needed for variables that are addressable 
(because their address is taken) to force proper gimplification.

Tested on SPARC/Solaris, applied on the mainline.


	PR c/65345
	* config/sparc/sparc.c (sparc_atomic_assign_expand_fenv): Adjust to
	use create_tmp_var_raw rather than create_tmp_var.

-- 
Eric Botcazou
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