cmd/compile: make DCE remove nodes after terminating if

cmd/compile: make DCE remove nodes after terminating if

This change makes compiler frontend dead code elimination of const expr if
statements introduced in https://golang.org/cl/38773 treat both
	if constCondTrue { ...; returnStmt } toBeRemoved...
	if constCondFalse { ...; } else { returnStmt } toBeRemoved...
identically to:
	if constCondTrue { ...; returnStmt } else { toBeRemoved... }

Where "constCondTrue" is a an expression that can be evaluated
to "true" during compile time.

The additional checks are only triggered for const expr
if conditions that evaluate to true.

name       old time/op       new time/op       delta
Template         431ms ± 2%        429ms ± 1%    ~     (p=0.491 n=8+6)
Unicode          198ms ± 4%        201ms ± 2%    ~     (p=0.234 n=7+6)
GoTypes          1.40s ± 1%        1.41s ± 2%    ~     (p=0.053 n=7+7)
Compiler         6.72s ± 2%        6.81s ± 1%  +1.35%  (p=0.011 n=7+7)
SSA              17.3s ± 1%        17.3s ± 2%    ~     (p=0.731 n=6+7)
Flate            275ms ± 2%        275ms ± 2%    ~     (p=0.902 n=7+7)
GoParser         340ms ± 2%        339ms ± 2%    ~     (p=0.902 n=7+7)
Reflect          910ms ± 2%        905ms ± 1%    ~     (p=0.310 n=6+6)
Tar              403ms ± 1%        403ms ± 2%    ~     (p=0.366 n=7+6)
XML              486ms ± 1%        490ms ± 1%    ~     (p=0.065 n=6+6)
StdCmd           56.2s ± 1%        56.6s ± 2%    ~     (p=0.620 n=7+7)

name       old user-time/op  new user-time/op  delta
Template         559ms ± 8%        557ms ± 7%    ~     (p=0.713 n=8+7)
Unicode          266ms ±13%        277ms ± 9%    ~     (p=0.157 n=8+7)
GoTypes          1.83s ± 2%        1.84s ± 1%    ~     (p=0.522 n=8+7)
Compiler         8.67s ± 4%        8.89s ± 4%    ~     (p=0.077 n=7+7)
SSA              23.9s ± 1%        24.2s ± 1%  +1.31%  (p=0.005 n=7+7)
Flate            351ms ± 4%        342ms ± 5%    ~     (p=0.105 n=7+7)
GoParser         437ms ± 2%        423ms ± 5%  -3.14%  (p=0.016 n=7+7)
Reflect          1.16s ± 3%        1.15s ± 2%    ~     (p=0.362 n=7+7)
Tar              517ms ± 4%        511ms ± 3%    ~     (p=0.538 n=7+7)
XML              619ms ± 3%        617ms ± 4%    ~     (p=0.483 n=7+7)

Fixes #23521

Change-Id: I165a7827d869aeb93ce6047d026ff873d039a4f3
Reviewed-on: https://go-review.googlesource.com/91056
Run-TryBot: Iskander Sharipov <iskander.sharipov@intel.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>