Implemented basic heap memory allocation tracking in MallocHooks using hooks registered with tcmall…

runtime/platform/assert.h

Index: runtime/platform/assert.h
diff --git a/runtime/platform/assert.h b/runtime/platform/assert.h
index 02e0e8f3bc3fac6763d66a52c8f2b6295b74a9a5..f9d86574220d81261b5fa761b3a9f73e5506cf02 100644
--- a/runtime/platform/assert.h
+++ b/runtime/platform/assert.h
@@ -299,6 +299,8 @@ T DynamicAssertionHelper::NotNull(const T p) {
 //   COMPILE_ASSERT(sizeof(foo) < 128);
 //
 
+namespace dart {
+
 template <bool>
 struct CompileAssert {};
 // Macro to concatenate two tokens. The helper is need to proper expansion
@@ -312,6 +314,7 @@ struct CompileAssert {};
                           __LINE__)[static_cast<bool>(expr) ? 1 : -1]
 #endif  // !defined(COMPILE_ASSERT)
 
+}  // namespace dart
 #if defined(TESTING)
 
 // EXPECT and FAIL are equivalent to ASSERT and FATAL except that they do not