Collect call site information and use that for estimating parameter types

tests/compiler/dart2js/compiler_helper.dart

Index: tests/compiler/dart2js/compiler_helper.dart
diff --git a/tests/compiler/dart2js/compiler_helper.dart b/tests/compiler/dart2js/compiler_helper.dart
index bf2fa672b65e62ac7e8c6274a9dcfa774f4ea3da..8a86f5c4c15a2a8baffabf7339b64691a81d5120 100644
--- a/tests/compiler/dart2js/compiler_helper.dart
+++ b/tests/compiler/dart2js/compiler_helper.dart
@@ -24,9 +24,15 @@ String compile(String code, [String entry = 'main']) {
   return generated;
 }
 
-String compileAll(String code) {
+MockCompiler compilerFor(String code, Uri uri) {
   MockCompiler compiler = new MockCompiler();
+  compiler.sourceFiles[uri.toString()] = new SourceFile(uri.toString(), code);
+  return compiler;
+}
+
+String compileAll(String code) {
   Uri uri = new Uri.fromComponents(scheme: 'source');
+  MockCompiler compiler = compilerFor(code, uri);
   compiler.sourceFiles[uri.toString()] = new SourceFile(uri.toString(), code);
   compiler.runCompiler(uri);
   return compiler.assembledCode;