Split ParserBase into separate file

Reviving/redoing littledan's previous CL.

R=nikolaos@chromium.org
BUG=

Review URL: https://codereview.chromium.org/1504833002

Cr-Commit-Position: refs/heads/master@{#32658}

src/parsing/parser.cc

@@ -17,7 +17,7 @@
 #include "src/compiler.h"
 #include "src/messages.h"
 #include "src/parsing/parameter-initializer-rewriter.h"
-#include "src/parsing/preparser.h"
+#include "src/parsing/parser-base.h"
 #include "src/parsing/rewriter.h"
 #include "src/parsing/scanner-character-streams.h"
 #include "src/runtime/runtime.h"

src/parsing/parser.h

@@ -9,6 +9,7 @@
 #include "src/ast/ast.h"
 #include "src/ast/scopes.h"
 #include "src/compiler.h"  // TODO(titzer): remove this include dependency
+#include "src/parsing/parser-base.h"
 #include "src/parsing/preparse-data.h"
 #include "src/parsing/preparse-data-format.h"
 #include "src/parsing/preparser.h"

src/parsing/preparser.cc

@@ -11,6 +11,7 @@
 #include "src/globals.h"
 #include "src/hashmap.h"
 #include "src/list.h"
+#include "src/parsing/parser-base.h"
 #include "src/parsing/preparse-data.h"
 #include "src/parsing/preparse-data-format.h"
 #include "src/parsing/preparser.h"