Go patch committed: check for ... with builtin functions

[Ian Lance Taylor]

The Go builtin functions other than append don't handle using ... to
pass a varargs argument.  This patch to the gccgo frontend checks for
that.  It also gives a better error message for an attempt to use
... with a type conversion.  Bootstrapped and ran Go testsuite on
x86_64-unknown-linux-gnu.  Committed to mainline.

Ian

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