Rename "parallel recompilation" to "concurrent recompilation".

src/types.h

 // Copyright 2013 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 74 matching lines @@
 // existing assumptions or tests.
 //
 // Consequently, do not use pointer equality for type tests, always use Is!
 //
 // Internally, all 'primitive' types, and their unions, are represented as
 // bitsets via smis. Class is a heap pointer to the respective map. Only
 // Constant's, or unions containing Class'es or Constant's, require allocation.
 // Note that the bitset representation is closed under both Union and Intersect.
 //
 // The type representation is heap-allocated, so cannot (currently) be used in
-// a parallel compilation context.
+// a concurrent compilation context.
 
 
 #define PRIMITIVE_TYPE_LIST(V)           \
   V(None,                0)              \
   V(Null,                1 << 0)         \
   V(Undefined,           1 << 1)         \
   V(Boolean,             1 << 2)         \
   V(Smi,                 1 << 3)         \
   V(OtherSigned32,       1 << 4)         \
   V(Unsigned32,          1 << 5)         \
@@ skipping 220 matching lines @@
     return Bounds(handle(Type::Union(b.lower, t), isl), b.upper);
   }
   static Bounds NarrowUpper(Bounds b, Handle<Type> t, Isolate* isl) {
     return Bounds(b.lower, handle(Type::Intersect(b.upper, t), isl));
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_TYPES_H_