global augmentation should not be resolved as modules

[mhegazy]

// a.ts
export { };

declare global {
  var x: number;
}

tsc --traceResolution c:\test\a.ts

======== Resolving module 'global' from 'c:/test/a.ts'. ========
Module resolution kind is not specified, using 'NodeJs'.
Loading module 'global' from 'node_modules' folder.
File 'c:/test/node_modules/global.ts' does not exist.
File 'c:/test/node_modules/global.tsx' does not exist.
File 'c:/test/node_modules/global.d.ts' does not exist.
File 'c:/test/node_modules/global/package.json' does not exist.
File 'c:/test/node_modules/global/index.ts' does not exist.
File 'c:/test/node_modules/global/index.tsx' does not exist.
File 'c:/test/node_modules/global/index.d.ts' does not exist.
File 'c:/test/node_modules/@types/global.ts' does not exist.
File 'c:/test/node_modules/@types/global.tsx' does not exist.
File 'c:/test/node_modules/@types/global.d.ts' does not exist.
File 'c:/test/node_modules/@types/global/package.json' does not exist.
File 'c:/test/node_modules/@types/global/index.ts' does not exist.
File 'c:/test/node_modules/@types/global/index.tsx' does not exist.
File 'c:/test/node_modules/@types/global/index.d.ts' does not exist.
File 'c:/node_modules/global.ts' does not exist.
File 'c:/node_modules/global.tsx' does not exist.
File 'c:/node_modules/global.d.ts' does not exist.
File 'c:/node_modules/global/package.json' does not exist.
File 'c:/node_modules/global/index.ts' does not exist.
File 'c:/node_modules/global/index.tsx' does not exist.
File 'c:/node_modules/global/index.d.ts' does not exist.
File 'c:/node_modules/@types/global.ts' does not exist.
File 'c:/node_modules/@types/global.tsx' does not exist.
File 'c:/node_modules/@types/global.d.ts' does not exist.
File 'c:/node_modules/@types/global/package.json' does not exist.
File 'c:/node_modules/@types/global/index.ts' does not exist.
File 'c:/node_modules/@types/global/index.tsx' does not exist.
File 'c:/node_modules/@types/global/index.d.ts' does not exist.
======== Module name 'global' was not resolved. ========