Ignore unused code paths

We don’t want to remove these as the generic code may need it in the future, but these code paths are not triggered through the existing language constructs.

lib/handlebars/compiler/javascript-compiler.js

@@ -763,6 +763,7 @@ JavaScriptCompiler.prototype = {
     this.inlineStack = [];
     for (var i = 0, len = inlineStack.length; i < len; i++) {
       var entry = inlineStack[i];
+      /* istanbul ignore if */
       if (entry instanceof Literal) {
         this.compileStack.push(entry);
       } else {
@@ -798,6 +799,7 @@ JavaScriptCompiler.prototype = {
     var stack = (this.isInline() ? this.inlineStack : this.compileStack),
         item = stack[stack.length - 1];
 
+    /* istanbul ignore if */
     if (item instanceof Literal) {
       return item.value;
     } else {