Use options register for blockHelperMissing

lib/handlebars/compiler/compiler.js

@@ -203,14 +203,16 @@ Handlebars.JavaScriptCompiler = function() {};
     },
 
     ambiguousMustache: function(mustache, program, inverse) {
-      var id = mustache.id, name = id.parts[0];
+      var id = mustache.id,
+          name = id.parts[0],
+          isBlock = program != null || inverse != null;
 
       this.opcode('getContext', id.depth);
 
       this.opcode('pushProgram', program);
       this.opcode('pushProgram', inverse);
 
-      this.opcode('invokeAmbiguous', name);
+      this.opcode('invokeAmbiguous', name, isBlock);
     },
 
     simpleMustache: function(mustache) {
@@ -555,6 +557,9 @@ Handlebars.JavaScriptCompiler = function() {};
       var current = this.topStack();
       params.splice(1, 0, current);
 
+      // Use the options value generated from the invocation
+      params[params.length-1] = 'options';
+
       this.source.push("if (!" + this.lastHelper + ") { " + current + " = blockHelperMissing.call(" + params.join(", ") + "); }");
     },
 
@@ -812,11 +817,11 @@ Handlebars.JavaScriptCompiler = function() {};
     // This operation emits more code than the other options,
     // and can be avoided by passing the `knownHelpers` and
     // `knownHelpersOnly` flags at compile-time.
-    invokeAmbiguous: function(name) {
+    invokeAmbiguous: function(name, helperCall) {
       this.context.aliases.functionType = '"function"';
 
       this.pushStackLiteral('{}');
-      var helper = this.setupHelper(0, name);
+      var helper = this.setupHelper(0, name, helperCall);
 
       var helperName = this.lastHelper = this.nameLookup('helpers', name, 'helper');