Adding visitors to regurgitate expression types or reset them.

test/cctest/cctest.gyp

 # Copyright 2012 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 #       notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 #       copyright notice, this list of conditions and the following
 #       disclaimer in the documentation and/or other materials provided
@@ skipping 65 matching lines @@
         'compiler/test-run-jsexceptions.cc',
         'compiler/test-run-jsops.cc',
         'compiler/test-run-machops.cc',
         'compiler/test-run-native-calls.cc',
         'compiler/test-run-properties.cc',
         'compiler/test-run-stackcheck.cc',
         'compiler/test-run-stubs.cc',
         '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',
         'gay-precision.cc',
         'gay-shortest.cc',
         'heap-tester.h',
         'print-extension.cc',
         'profiler-extension.cc',
         'test-accessors.cc',
         'test-alloc.cc',
         'test-api.cc',
         'test-api.h',
         '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',
         'test-bit-vector.cc',
         'test-circular-queue.cc',
         'test-compiler.cc',
         'test-constantpool.cc',
         'test-conversions.cc',
         'test-cpu-profiler.cc',
         'test-date.cc',
@@ skipping 39 matching lines @@
         'test-simd.cc',
         'test-spaces.cc',
         'test-strings.cc',
         'test-symbols.cc',
         'test-strtod.cc',
         'test-thread-termination.cc',
         'test-threads.cc',
         'test-transitions.cc',
         'test-typedarrays.cc',
         'test-types.cc',
+        'test-typing-reset.cc',
         'test-unbound-queue.cc',
         'test-unboxed-doubles.cc',
         'test-unique.cc',
         'test-unscopables-hidden-prototype.cc',
         'test-utils.cc',
         'test-version.cc',
         'test-weakmaps.cc',
         'test-weaksets.cc',
         'trace-extension.cc',
       ],
@@ skipping 144 matching lines @@
             '../../tools/js2c.py',
             '<@(_outputs)',
             'TEST',  # type
             '<@(file_list)',
           ],
         }
       ],
     },
   ],
 }