[turbofan] Fix printing of FieldAccess.

Avoid the stupid newline when the name is a String, which is
automatically appended by the Object::Print() method. Just use
the Name::NamePrint() method instead.

Bug: v8:5267
Change-Id: I12ec878325b6f6ecdd8633a5ac8129b2398ddf9a
Reviewed-on: https://chromium-review.googlesource.com/778823Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Commit-Queue: Benedikt Meurer <bmeurer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#49486}

src/compiler/simplified-operator.cc

@@ -54,7 +54,7 @@ std::ostream& operator<<(std::ostream& os, FieldAccess const& access) {
 #ifdef OBJECT_PRINT
   Handle<Name> name;
   if (access.name.ToHandle(&name)) {
-    name->Print(os);
+    name->NamePrint(os);
     os << ", ";
   }
   Handle<Map> map;