Revert "fix(compiler): ignore calls to unresolved symbols in metadata (#15970)"

This reverts commit ce47d33cd9.

packages/compiler/src/aot/static_reflector.ts

@@ -601,7 +601,7 @@ export class StaticReflector implements ɵReflectorReader {
               case 'ignore':
                 return expression;
             }
-            return IGNORE;
+            return null;
           }
           return mapStringMap(expression, (value, name) => simplify(value));
         }

packages/compiler/test/aot/static_reflector_spec.ts

@@ -546,30 +546,6 @@ describe('StaticReflector', () => {
     expect(annotation.providers).toEqual([1, 2, 3, 4, 5, 6, 7]);
   });
 
-  it('should ignore unresolved calls', () => {
-    const data = Object.create(DEFAULT_TEST_DATA);
-    const file = '/tmp/src/invalid-component.ts';
-    data[file] = `
-        import {Component} from '@angular/core';
-        import {unknown} from 'unresolved';
-
-        @Component({
-          selector: 'tmp',
-          template: () => {},
-          providers: [triggers()]
-        })
-        export class BadComponent {
-
-        }
-      `;
-    init(data, [], () => {}, {verboseInvalidExpression: true});
-
-    const badComponent = reflector.getStaticSymbol(file, 'BadComponent');
-    const annotations = reflector.annotations(badComponent);
-    const annotation = annotations[0];
-    expect(annotation.providers).toEqual([]);
-  });
-
   describe('inheritance', () => {
     class ClassDecorator {
       constructor(public value: any) {}

packages/compiler/test/aot/static_symbol_resolver_spec.ts

@@ -436,9 +436,6 @@ export class MockStaticSymbolResolverHost implements StaticSymbolResolverHost {
       }
       return baseName + '.d.ts';
     }
-    if (modulePath == 'unresolved') {
-      return undefined;
-    }
     return '/tmp/' + modulePath + '.d.ts';
   }