fix bug involving typed nil constants: interface = (*int)(nil) is not the same as interface = nil.
fix bug involving typed nil constants:
interface = (*int)(nil) is not the same as
interface = nil.

package main
func main() {
	var x interface{} = (*int)(nil);
	println(x.(*int));
}

R=ken
OCL=31232
CL=31232

tianon/debian-golang,dsriram/golang,gnanderson/go,apparentlymart/golang,tianon/debian-golang,dsriram/golang,tianon/debian-golang,gnanderson/go,nightlyone/golang,pombredanne/go-deleteme,ssrl/go,tv42/old-go,ssrl/go,h8liu/golang,tianon/debian-golang,bdwalton/debian-golang,bdwalton/debian-golang,nightlyone/golang,nightlyone/golang,tianon/debian-golang,bdwalton/debian-golang,pombredanne/go-deleteme,ssrl/go,h8liu/golang,nightlyone/golang,pombredanne/go-deleteme,ssrl/go,bdwalton/debian-golang,pombredanne/go-deleteme,gnanderson/go,h8liu/golang,apparentlymart/golang,nightlyone/golang,apparentlymart/golang,gnanderson/go,bdwalton/debian-golang,ssrl/go,pombredanne/go-deleteme,pombredanne/go-deleteme,tv42/old-go,bdwalton/debian-golang,tianon/debian-golang,tianon/debian-golang,tv42/old-go,gnanderson/go,h8liu/golang,ssrl/go,nightlyone/golang,dsriram/golang,ssrl/go,tv42/old-go,h8liu/golang,h8liu/golang,apparentlymart/golang,apparentlymart/golang,tianon/debian-golang,bdwalton/debian-golang,tv42/old-go,apparentlymart/golang,dsriram/golang,h8liu/golang,pombredanne/go-deleteme,dsriram/golang,dsriram/golang,tv42/old-go,bdwalton/debian-golang,apparentlymart/golang,nightlyone/golang,dsriram/golang,gnanderson/go,tv42/old-go,gnanderson/go