Added tests for const modifiers.

tests/cases/fourslash/getOccurrencesConst02.ts

@@ -0,0 +1,16 @@
+/// <reference path='fourslash.ts' />
+
+////module m {
+////    declare [|const|] x;
+////    declare [|const|] enum E {
+////    }
+////}
+////
+////declare [|const|] x;
+////declare [|const|] enum E {
+////}
+
+test.ranges().forEach(range => {
+    goTo.position(range.start);
+    verify.occurrencesAtPositionCount(0);
+});

tests/cases/fourslash/getOccurrencesConst03.ts

@@ -0,0 +1,16 @@
+/// <reference path='fourslash.ts' />
+
+////module m {
+////    export [|const|] x;
+////    export [|const|] enum E {
+////    }
+////}
+////
+////export [|const|] x;
+////export [|const|] enum E {
+////}
+
+test.ranges().forEach(range => {
+    goTo.position(range.start);
+    verify.occurrencesAtPositionCount(0);
+});

tests/cases/fourslash/getOccurrencesConst04.ts

@@ -0,0 +1,12 @@
+/// <reference path='fourslash.ts' />
+
+////export const class C {
+////    private static [|const|] foo;
+////    constructor(public [|const|] foo) {
+////    }
+////}
+
+test.ranges().forEach(range => {
+    goTo.position(range.start);
+    verify.occurrencesAtPositionCount(0);
+});