[committed] amdgcn: Pass vector parameters in memory

[Andrew Stubbs]

This patch ensures that programs using vector extensions to pass vectors 
to functions pass the vectors in memory.

Even though we could technically do this in registers, the ABI would 
have to be reworked to do so, and there's no call for that yet (maybe if 
we want vector libgcc/libm).

This change doesn't have any observable affect on the testsuite, just 
yet, but when I add smaller vector sizes (still a work-in-progress) then 
the testcase failures become apparent.

Andrew
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