Fix stack id "leak" on replaceStack

lib/handlebars/compiler/javascript-compiler.js

@@ -688,6 +688,7 @@ JavaScriptCompiler.prototype = {
     var prefix = '',
         inline = this.isInline(),
         stack,
+        createdStack,
         usedLiteral;
 
     // If we are currently inline then we want to merge the inline statement into the
@@ -701,7 +702,8 @@ JavaScriptCompiler.prototype = {
         usedLiteral = true;
       } else {
         // Get or create the current stack name for use by the inline
-        var name = this.stackSlot ? this.topStackName() : this.incrStack();
+        createdStack = !this.stackSlot;
+        var name = !createdStack ? this.topStackName() : this.incrStack();
 
         prefix = '(' + this.push(name) + ' = ' + top + '),';
         stack = this.topStack();
@@ -716,6 +718,9 @@ JavaScriptCompiler.prototype = {
       if (!usedLiteral) {
         this.popStack();
       }
+      if (createdStack) {
+        this.stackSlot--;
+      }
       this.push('(' + prefix + item + ')');
     } else {
       // Prevent modification of the context depth variable. Through replaceStack