get rid of tmp variable, we dont need it

src/generators/dom/Block.js

@@ -154,9 +154,4 @@ export default class Block {
 			}
 		`;
 	}
-
-	tmp () {
-		if ( !this._tmp ) this._tmp = this.getUniqueName( 'tmp' );
-		return this._tmp;
-	}
 }

src/generators/dom/visitors/Element/Attribute.js

@@ -81,8 +81,7 @@ export default function visitAttribute ( generator, block, state, node, attribut
 
 		block.builders.create.addLine( updater );
 		block.builders.update.addBlock( deindent`
-			if ( ( ${block.tmp()} = ${value} ) !== ${last} ) {
-				${last} = ${block.tmp()};
+			if ( ${last} !== ( ${last} = ${value} ) ) {
 				${updater}
 			}
 		` );

src/generators/dom/visitors/MustacheTag.js

@@ -9,8 +9,8 @@ export default function visitMustacheTag ( generator, block, state, node ) {
 	block.addElement( name, `${generator.helper( 'createText' )}( last_${name} )`, state.parentNode, true );
 
 	block.builders.update.addBlock( deindent`
-		if ( ( ${block.tmp()} = ${snippet} ) !== last_${name} ) {
-			${name}.data = last_${name} = ${block.tmp()};
+		if ( last_${name} !== ( last_${name} = ${snippet} ) ) {
+			${name}.data = last_${name};
 		}
 	` );
 }

src/generators/dom/visitors/RawMustacheTag.js

@@ -26,8 +26,7 @@ export default function visitRawMustacheTag ( generator, block, state, node ) {
 	}
 
 	block.builders.update.addBlock( deindent`
-		if ( ( ${block.tmp()} = ${snippet} ) !== last_${name} ) {
-			last_${name} = ${block.tmp()};
+		if ( last_${name} !== ( last_${name} = ${snippet} ) ) {
 			${detachStatement}
 			${mountStatement}
 		}

test/js/samples/each-block-changed-check/expected.js

@@ -75,18 +75,15 @@ function create_each_block ( root, each_block_value, comment, comment_index, com
 		},
 
 		update: function ( changed, root, each_block_value, comment, comment_index ) {
-			var tmp;
-
-			if ( ( tmp = comment.author ) !== last_text ) {
-				text.data = last_text = tmp;
+			if ( last_text !== ( last_text = comment.author ) ) {
+				text.data = last_text;
 			}
 
-			if ( ( tmp = root.elapsed(comment.time, root.time) ) !== last_text_2 ) {
-				text_2.data = last_text_2 = tmp;
+			if ( last_text_2 !== ( last_text_2 = root.elapsed(comment.time, root.time) ) ) {
+				text_2.data = last_text_2;
 			}
 
-			if ( ( tmp = comment.html ) !== last_raw ) {
-				last_raw = tmp;
+			if ( last_raw !== ( last_raw = comment.html ) ) {
 				detachBetween( raw_before, raw_after );
 				raw_before.insertAdjacentHTML( 'afterend', last_raw );
 			}