remove identifier comparison checks

src/ast/conditions.js

@@ -14,7 +14,6 @@ function not ( value ) {
 
 function equals ( a, b, strict ) {
 	if ( a.type !== b.type ) return undefined;
-	if ( a.type === 'Identifier' ) return a.name === b.name && a.name !== 'NaN';
 	if ( a.type === 'Literal' ) return strict ? a.value === b.value : a.value == b.value;
 }
 

test/function/skips-dead-branches-f/_config.js

@@ -1,7 +1,7 @@
 var assert = require( 'assert' );
 
 module.exports = {
-	description: 'skips a dead branch (f)',
+	description: 'skips a dead branch (g)',
 	code: function ( code ) {
 		assert.equal( code.indexOf( 'obj.foo = function' ), -1, code );
 	}

test/function/skips-dead-branches-f/main.js

@@ -7,5 +7,5 @@ function bar () {
 	console.log( 'this should be included' );
 }
 
-if ( NaN === NaN ) obj.foo();
+if ( 42 != '42' ) obj.foo();
 bar();

test/function/skips-dead-branches-g/_config.js

@@ -1,8 +0,0 @@
-var assert = require( 'assert' );
-
-module.exports = {
-	description: 'skips a dead branch (g)',
-	code: function ( code ) {
-		assert.equal( code.indexOf( 'obj.foo = function' ), -1, code );
-	}
-}

test/function/skips-dead-branches-g/main.js

@@ -1,11 +0,0 @@
-var obj = {};
-obj.foo = function () {
-	console.log( 'this should be excluded' );
-}
-
-function bar () {
-	console.log( 'this should be included' );
-}
-
-if ( 42 != '42' ) obj.foo();
-bar();