Fix find all refs and goto def for decorators

src/compiler/utilities.ts

@@ -703,6 +703,7 @@ module ts {
             case SyntaxKind.TemplateExpression:
             case SyntaxKind.NoSubstitutionTemplateLiteral:
             case SyntaxKind.OmittedExpression:
+            case SyntaxKind.Decorator:
                 return true;
             case SyntaxKind.QualifiedName:
                 while (node.parent.kind === SyntaxKind.QualifiedName) {

tests/cases/fourslash/findAllRefsOnDecorators.ts

@@ -0,0 +1,19 @@
+/// <reference path="fourslash.ts" />
+
+// @Filename: a.ts
+////function decorator(target) {
+////    return target;
+////}
+////decorator();
+
+// @Filename: b.ts
+////@deco/*1*/rator @decorator("again")
+////class C {
+////    @decorator
+////    method() {}
+////}
+
+goTo.file("b.ts");
+goTo.marker("1");
+
+verify.referencesCountIs(5);

tests/cases/fourslash/goToDefinitionDecorator.ts

@@ -0,0 +1,26 @@
+/// <reference path='fourslash.ts' />
+
+// @Filename: b.ts
+////@/*decoratorUse*/decorator
+////class C {
+////    @decora/*decoratorFactoryUse*/torFactory(a, "22", true)
+////    method() {}
+////}
+
+
+// @Filename: a.ts
+/////*decoratorDefinition*/function decorator(target) {
+////    return target;
+////}
+/////*decoratorFactoryDefinition*/function decoratorFactory(...args) {
+////    return target => target;
+////}
+
+
+goTo.marker('decoratorUse');
+goTo.definition();
+verify.caretAtMarker('decoratorDefinition');
+
+goTo.marker('decoratorFactoryUse');
+goTo.definition();
+verify.caretAtMarker('decoratorFactoryDefinition');