fix(Compiler): relax childIsRecursive check (#8705)

Fix how the compiler checks for recursive components by also considering
component descendants. Previously, it only checked if the current
component was evaluated previously. This failed in certain cases of
mutually recursive components, causing `createAsync` in tests to not
resolve.

closes [7084](https://github.com/angular/angular/issues/7084)

modules/@angular/compiler/src/runtime_compiler.ts

@@ -115,7 +115,9 @@ export class RuntimeCompiler implements ComponentResolver {
           this._metadataResolver.getViewDirectivesMetadata(dep.comp.type.runtime);
       var childViewPipes: CompilePipeMetadata[] =
           this._metadataResolver.getViewPipesMetadata(dep.comp.type.runtime);
-      var childIsRecursive = ListWrapper.contains(childCompilingComponentsPath, childCacheKey);
+      var childIsRecursive = childCompilingComponentsPath.indexOf(childCacheKey) > -1 ||
+          childViewDirectives.some(
+              dir => childCompilingComponentsPath.indexOf(dir.type.runtime) > -1);
       childCompilingComponentsPath.push(childCacheKey);
 
       var childComp = this._loadAndCompileComponent(

modules/@angular/core/test/linker/regression_integration_spec.ts

@@ -4,7 +4,7 @@ import {AsyncTestCompleter} from '@angular/core/testing/testing_internal';
 
 import {IS_DART} from '../../src/facade/lang';
 
-import {Component, Pipe, PipeTransform, provide, ViewMetadata, OpaqueToken, Injector} from '@angular/core';
+import {Component, Pipe, PipeTransform, provide, ViewMetadata, PLATFORM_PIPES, OpaqueToken, Injector, forwardRef} from '@angular/core';
 import {NgIf, NgClass} from '@angular/common';
 import {CompilerConfig} from '@angular/compiler';
 
@@ -162,8 +162,7 @@ function declareTests({useJit}: {useJit: boolean}) {
 
     it('should support ngClass before a component and content projection inside of an ngIf',
        inject(
-           [TestComponentBuilder, AsyncTestCompleter],
-           (tcb: TestComponentBuilder, async: AsyncTestCompleter) => {
+           [TestComponentBuilder, AsyncTestCompleter], (tcb: TestComponentBuilder, async: any) => {
              tcb.overrideView(
                     MyComp1, new ViewMetadata({
                       template: `A<cmp-content *ngIf="true" [ngClass]="'red'">B</cmp-content>C`,
@@ -177,6 +176,15 @@ function declareTests({useJit}: {useJit: boolean}) {
                  });
            }));
 
+    it('should handle mutual recursion entered from multiple sides - #7084',
+       inject(
+           [TestComponentBuilder, AsyncTestCompleter], (tcb: TestComponentBuilder, async: any) => {
+             tcb.createAsync(FakeRecursiveComp).then((fixture) => {
+               fixture.detectChanges();
+               expect(fixture.nativeElement).toHaveText('[]');
+               async.done();
+             });
+           }));
 
   });
 }
@@ -199,3 +207,37 @@ class CustomPipe implements PipeTransform {
 @Component({selector: 'cmp-content', template: `<ng-content></ng-content>`})
 class CmpWithNgContent {
 }
+
+@Component({
+  selector: 'left',
+  template: `L<right *ngIf="false"></right>`,
+  directives: [
+    NgIf,
+    forwardRef(() => RightComp),
+  ]
+})
+class LeftComp {
+}
+
+@Component({
+  selector: 'right',
+  template: `R<left *ngIf="false"></left>`,
+  directives: [
+    NgIf,
+    forwardRef(() => LeftComp),
+  ]
+})
+class RightComp {
+}
+
+@Component({
+  selector: 'fakeRecursiveComp',
+  template: `[<left *ngIf="false"></left><right *ngIf="false"></right>]`,
+  directives: [
+    NgIf,
+    forwardRef(() => LeftComp),
+    forwardRef(() => RightComp),
+  ]
+})
+export class FakeRecursiveComp {
+}