dart2js: do typechecking even if suppressWarnings is on

pkg/compiler/lib/src/compiler.dart

Index: pkg/compiler/lib/src/compiler.dart
diff --git a/pkg/compiler/lib/src/compiler.dart b/pkg/compiler/lib/src/compiler.dart
index 9c7995aa321fd7abeafb25a15ff95e1e88fd3e24..99c535eba592f30f6285be9f905b6b0cd4255a54 100644
--- a/pkg/compiler/lib/src/compiler.dart
+++ b/pkg/compiler/lib/src/compiler.dart
@@ -1989,9 +1989,9 @@ class _CompilerResolution implements Resolution {
       assert(invariant(element, !element.isSynthesized || tree == null));
       ResolutionImpact resolutionImpact =
           compiler.resolver.resolve(element);
-      if (tree != null &&
-          !compiler.analyzeSignaturesOnly &&
-          !reporter.options.suppressWarnings) {
+      if (tree != null && !compiler.analyzeSignaturesOnly) {
+        // TODO(het): don't do this if suppressWarnings is on, currently we have
+        // to do it because the typechecker also sets types
         // Only analyze nodes with a corresponding [TreeElements].
         compiler.checker.check(element);
       }