Adding testcase for the incorrect eliding of the import declarations

tests/baselines/reference/elidingImportNames.js

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+//// [tests/cases/compiler/elidingImportNames.ts] ////
+
+//// [elidingImportNames_test.ts]
+
+import a = require('elidingImportNames_main'); // alias used in typeof
+var b = a;
+var x: typeof a;
+import a2 = require('elidingImportNames_main1'); // alias not used in typeof
+var b2 = a2;
+
+
+//// [elidingImportNames_main.ts]
+export var main = 10;
+
+//// [elidingImportNames_main1.ts]
+export var main = 10;
+
+//// [elidingImportNames_main.js]
+exports.main = 10;
+//// [elidingImportNames_main1.js]
+exports.main = 10;
+//// [elidingImportNames_test.js]
+var b = a;
+var x;
+var a2 = require('elidingImportNames_main1'); // alias not used in typeof
+var b2 = a2;

tests/baselines/reference/elidingImportNames.types

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+=== tests/cases/compiler/elidingImportNames_test.ts ===
+
+import a = require('elidingImportNames_main'); // alias used in typeof
+>a : typeof a
+
+var b = a;
+>b : typeof a
+>a : typeof a
+
+var x: typeof a;
+>x : typeof a
+>a : typeof a
+
+import a2 = require('elidingImportNames_main1'); // alias not used in typeof
+>a2 : typeof a2
+
+var b2 = a2;
+>b2 : typeof a2
+>a2 : typeof a2
+
+
+=== tests/cases/compiler/elidingImportNames_main.ts ===
+export var main = 10;
+>main : number
+
+=== tests/cases/compiler/elidingImportNames_main1.ts ===
+export var main = 10;
+>main : number
+

tests/cases/compiler/elidingImportNames.ts

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+// @module: commonjs
+
+// @Filename: elidingImportNames_test.ts
+import a = require('elidingImportNames_main'); // alias used in typeof
+var b = a;
+var x: typeof a;
+import a2 = require('elidingImportNames_main1'); // alias not used in typeof
+var b2 = a2;
+
+
+// @Filename: elidingImportNames_main.ts
+export var main = 10;
+
+// @Filename: elidingImportNames_main1.ts
+export var main = 10;