Adding visitors to regurgitate expression types or reset them.

test/cctest/cctest.gyp

Index: test/cctest/cctest.gyp
diff --git a/test/cctest/cctest.gyp b/test/cctest/cctest.gyp
index 10207c1038234e682dd381dacfb510256d449b91..d58a959e4d38bee908bd66ca34e3715a015231fc 100644
--- a/test/cctest/cctest.gyp
+++ b/test/cctest/cctest.gyp
@@ -83,6 +83,8 @@
         'compiler/test-run-variables.cc',
         'compiler/test-simplified-lowering.cc',
         'cctest.cc',
+        'expression-type-collector.cc',
+        'expression-type-collector.h',
         'interpreter/test-bytecode-generator.cc',
         'interpreter/test-interpreter.cc',
         'gay-fixed.cc',
@@ -97,6 +99,7 @@
         'test-api-interceptors.cc',
         'test-array-list.cc',
         'test-ast.cc',
+        'test-ast-expression-visitor.cc',
         'test-atomicops.cc',
         'test-bignum.cc',
         'test-bignum-dtoa.cc',
@@ -156,6 +159,7 @@
         'test-transitions.cc',
         'test-typedarrays.cc',
         'test-types.cc',
+        'test-typing-reset.cc',
         'test-unbound-queue.cc',
         'test-unboxed-doubles.cc',
         'test-unique.cc',