Adding visitors to regurgitate expression types or reset them.

tools/gyp/v8.gyp

Index: tools/gyp/v8.gyp
diff --git a/tools/gyp/v8.gyp b/tools/gyp/v8.gyp
index caca437a7ebb53117c20d5db72ec3c0a31c7d5a2..432c7ab060588bdb5d24a841e2c8639f79d5f957 100644
--- a/tools/gyp/v8.gyp
+++ b/tools/gyp/v8.gyp
@@ -400,12 +400,14 @@
         '../../src/assembler.h',
         '../../src/assert-scope.h',
         '../../src/assert-scope.cc',
-        '../../src/ast-value-factory.cc',
-        '../../src/ast-value-factory.h',
+        '../../src/ast-expression-visitor.cc',
+        '../../src/ast-expression-visitor.h',
         '../../src/ast-literal-reindexer.cc',
         '../../src/ast-literal-reindexer.h',
         '../../src/ast-numbering.cc',
         '../../src/ast-numbering.h',
+        '../../src/ast-value-factory.cc',
+        '../../src/ast-value-factory.h',
         '../../src/ast.cc',
         '../../src/ast.h',
         '../../src/background-parsing-task.cc',
@@ -969,6 +971,8 @@
         '../../src/types-inl.h',
         '../../src/types.cc',
         '../../src/types.h',
+        '../../src/typing-reset.cc',
+        '../../src/typing-reset.h',
         '../../src/typing.cc',
         '../../src/typing.h',
         '../../src/unbound-queue-inl.h',