Go patch committed: Avoid bogus init loop error

[Ian Lance Taylor]

Code like this

type S struct {
	F int
}

var V = S{F: 1}

var F = V.F

could trigger an incorrect "variable initializer refers to itself" error
because the Go frontend would confuse itself into thinking that the "F"
in the composite literal was the same as the global variable "F", rather
than being the name of the field "F".

This patch fixes the problem.  Bootstrapped and ran Go testsuite on
x86_64-unknown-linux-gnu.  Committed to mainline.

Ian

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