Report file errors on loader

Currently compilation errors get reported in the entry points (polyfills.ts, main.ts) and for the compilation itself afterwards:

ERROR in ./src/polyfills.ts
Module build failed: Error: TypeScript compilation failed.
    at plugin.done.then (/Users/iminar/tmp/regression-test-project/node_modules/@angular/cli/node_modules/@ngtools/webpack/src/loader.js:479:27)
 @ multi ./src/polyfills.ts
ERROR in ./src/main.ts
Module build failed: Error: TypeScript compilation failed.
    at plugin.done.then (/Users/iminar/tmp/regression-test-project/node_modules/@angular/cli/node_modules/@ngtools/webpack/src/loader.js:479:27)
    at process._tickCallback (internal/process/next_tick.js:103:7)
 @ multi ./src/main.ts
ERROR in Error: Unexpected value 'MdIconModule in /Users/iminar/tmp/regression-test-project/node_modules/@angular/material/material.d.ts' imported by the module 'AppModule in /Users/iminar/tmp/regression-test-project/src/app/app.module.ts'. Please add a @NgModule annotation.

We should instead report errors for a given file on the file loader, and the rest of these errors in the compilation.

[bjohnson-va]

Is there a workaround for this?

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