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 76ce20404fa4cda077173a4b9fdd5fffb1b6149a..45c306a6f3c28ad4bc8d2590ac7b0030d972c11e 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',