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 bebcbe2ae3b4a338d9ca30652ba714e420e9a13a..2f4ef3fc3c03bdee8d4eb3aeea4f41583d213768 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',
@@ -970,6 +972,8 @@
         '../../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',