bug#15089: awk-mode indentation of line after /= statement with comment

[Glenn Morris]

Package: emacs,cc-mode
Version: 24.3
Severity: minor

emacs -Q foo.awk

Enter buffer contents:

#!/usr/bin/gawk -f
BEGIN {
   x = 4
   x /= 2    # comment
        y = 3
   print x, y
}

Use TAB to indent each line. The "y =" line is indented too much.
No such problem with +=, -=, etc; only with /=. And only if a comment
after if (actually, only if whitespace after "/= 2", it seems).