[RFC PATCH, alpha]: ABI change: pass SFmode and SCmode variable arguments by reference

[Joseph Myers]

On Fri, 2 Sep 2016, Uros Bizjak wrote:

>      argument.  Passing _Complex float as a variable argument never
>      worked on alpha.  Thus, we have no backward compatibility issues

Presumably there should be an architecture-independent execution test of 
passing _Complex float in variable arguments - either new, or a 
pre-existing one whose XFAIL or skip for alpha can be removed.  (That is, 
one in the GCC testsuite rather than relying on a libffi test to test 
GCC.)

-- 
Joseph S. Myers
joseph@codesourcery.com