[heap,cctest] Fix CodeRange tests that call AllocateRawMemory directly.

test/cctest/test-spaces.cc

Index: test/cctest/test-spaces.cc
diff --git a/test/cctest/test-spaces.cc b/test/cctest/test-spaces.cc
index 292b27fd00cad41a8057f10bf98c8e31d7b0ed03..bbf9835a85a731ee07b8a380bb8891a0dfe60fc3 100644
--- a/test/cctest/test-spaces.cc
+++ b/test/cctest/test-spaces.cc
@@ -224,8 +224,10 @@ TEST(Regress3540) {
   }
   Address address;
   size_t size;
+  size_t request_size = code_range_size - 2 * pageSize;
   address = code_range->AllocateRawMemory(
-      code_range_size - 2 * pageSize, code_range_size - 2 * pageSize, &size);
+      request_size, request_size - (2 * MemoryAllocator::CodePageGuardSize()),
+      &size);
   CHECK(address != NULL);
   Address null_address;
   size_t null_size;