Re-reland "More tests for Union & Intersect"

src/types.h

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_TYPES_H_
 #define V8_TYPES_H_
 
 #include "handles.h"
 
 namespace v8 {
@@ skipping 83 matching lines @@
 // existing assumptions or tests.
 // Consequently, do not use pointer equality for type tests, always use Is!
 //
 // The NowIs operator implements state-sensitive subtying, as described above.
 // Any compilation decision based on such temporary properties requires runtime
 // guarding!
 //
 // PROPERTIES
 //
 // Various formal properties hold for constructors, operators, and predicates
-// over types. For example, constructors are injective, subtyping is a partial
-// order, and union and intersection satisfy the usual algebraic properties.
+// over types. For example, constructors are injective, subtyping is a complete
+// partial order, union and intersection satisfy the usual algebraic properties.
 //
 // See test/cctest/test-types.cc for a comprehensive executable specification,
-// especially with respect to the proeprties of the more exotic 'temporal'
+// especially with respect to the properties of the more exotic 'temporal'
 // constructors and predicates (those prefixed 'Now').
 //
 // IMPLEMENTATION
 //
 // Internally, all 'primitive' types, and their unions, are represented as
 // bitsets. Class is a heap pointer to the respective map. Only Constant's, or
 // unions containing Class'es or Constant's, currently require allocation.
 // Note that the bitset representation is closed under both Union and Intersect.
 //
 // There are two type representations, using different allocation:
@@ skipping 408 matching lines @@
   bool Narrows(BoundsImpl that) {
     return that.lower->Is(this->lower) && this->upper->Is(that.upper);
   }
 };
 
 typedef BoundsImpl<ZoneTypeConfig> Bounds;
 
 } }  // namespace v8::internal
 
 #endif  // V8_TYPES_H_