cmd/compile: fix label redefinition error column numbers

Ensure that label redefinition error column numbers
print the actual start of the label instead of the
position of the label's delimiting token ":".

For example, given this program:

package main

func main() {

            foo:
   foo:
foo:
foo            :
}

* Before:
main.go:5:13: label foo defined and not used
main.go:6:7: label foo already defined at main.go:5:13
main.go:7:4: label foo already defined at main.go:5:13
main.go:8:16: label foo already defined at main.go:5:13

* After:
main.go:5:13: label foo defined and not used
main.go:6:4: label foo already defined at main.go:5:13
main.go:7:1: label foo already defined at main.go:5:13
main.go:8:1: label foo already defined at main.go:5:13

Fixes #26411

Change-Id: I8eb874b97fdc8862547176d57ac2fa0f075f2367
Reviewed-on: https://go-review.googlesource.com/c/124595


Run-TryBot: Emmanuel Odeke <emm.odeke@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@golang.org>