[parser] Add new FunctionNameInferrer state before parsing param

Create new state before parsing FormalParameter because we don't
want to use any of the parameters as an inferred function name.

Previously the stacktrace was:
  test.js:3: Error: boom
      throw new Error('boom');
      ^
  Error: boom
      at param (test.js:3:11)
      at test.js:4:5
      at test.js:6:3

The stacktrace with this patch:
  test.js:3: Error: boom
      throw new Error('boom');
      ^
  Error: boom
      at test.js:3:11
      at test.js:4:5
      at test.js:6:3


Bug: v8:6822, v8:6513
Change-Id: Ifbadc660fc4e85248af405acd67c025f11662bd4
Reviewed-on: https://chromium-review.googlesource.com/742657Reviewed-by: Adam Klein <adamk@chromium.org>
Commit-Queue: Sathya Gunasekaran <gsathya@chromium.org>
Cr-Commit-Position: refs/heads/master@{#49042}

src/parsing/parser-base.h

@@ -3710,6 +3710,7 @@ void ParserBase<Impl>::ParseFormalParameter(FormalParametersT* parameters,
   //   BindingElement[?Yield, ?GeneratorParameter]
   bool is_rest = parameters->has_rest;
 
+  FuncNameInferrer::State fni_state(fni_);
   ExpressionT pattern = ParsePrimaryExpression(CHECK_OK_CUSTOM(Void));
   ValidateBindingPattern(CHECK_OK_CUSTOM(Void));
 

test/message/fail/func-name-inferrer-arg-1.js

+// Copyright 2017 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+(function (param = function() { throw new Error('boom') }) {
+  (() => {
+    param();
+  })();
+
+})();

test/message/fail/func-name-inferrer-arg-1.out

+*%(basename)s:5: Error: boom
+(function (param = function() { throw new Error('boom') }) {
+                                ^
+Error: boom
+    at param (*%(basename)s:5:39)
+    at *%(basename)s:7:5
+    at *%(basename)s:8:5
+    at *%(basename)s:10:3
\ No newline at end of file

test/message/fail/func-name-inferrer-arg.js

+// Copyright 2017 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+(function (param) {
+  (() => {
+    throw new Error('boom');
+  })();
+
+})();

test/message/fail/func-name-inferrer-arg.out

+*%(basename)s:7: Error: boom
+    throw new Error('boom');
+    ^
+Error: boom
+    at *%(basename)s:7:11
+    at *%(basename)s:8:5
+    at *%(basename)s:10:3
\ No newline at end of file