[gccgo] Implement ...T

[Ian Lance Taylor]

The Go language recently picked up a new construct: you can specify
the type permitted for a varargs argument, which causes the caller to
pass a slice of that type rather than a struct converted to an empty
interface.  This patch implements that.  I reworked the varargs
support to lower varargs function calls to regular calls, rather than
doing everything when converting the function call to GENERIC.

Committed to gccgo branch.

Ian

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