[gccgo] -fsplit-stack fix: Only use two regs in 32-bit mode

[Ian Lance Taylor]

In 32-bit the -fsplit-stack code doesn't permit three register
parameters when the stack frame is large, because it needs a scratch
register.  This patch ensures that when optimizing the calling
convention for a static function, we use at most two registers
parameters when -fsplit-stack is in effect.  Committed to gccgo
branch.

Ian

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