

###### JerryScript revision
2faafa4


###### Build platform
Ubuntu 18.04.5 LTS(Linux 4.15.0-119-generic x86_64)

###### Build steps
```
./tools/build.py --clean --debug --compile-flag=-fsanitize=address \
--compile-flag=-m32 --compile-flag=-fno-omit-frame-pointer \
--compile-flag=-fno-common --compile-flag=-g --strip=off \
--system-allocator=on --logging=on --linker-flag=-fuse-ld=gold \
--error-messages=on --profile=es2015-subset  --builddir=$PWD/build

```


###### Test case
```
var obj1 = new Proxy({length: 2, 0: '', 1: ''}, { get: function(o, k) { get.push(k); return o[k]; }});
var weakset = new WeakSet();
weakset.add(obj1);

```

###### Output
```
ICE: Assertion '(object_p->u1.property_list_cp & ~JMEM_TAG_MASK) == 0' failed at /root/jerryscript/jerry-core/ecma/base/ecma-gc.c(ecma_gc_free_object):1655.
Error: ERR_FAILED_INTERNAL_ASSERTION
Aborted

```

Credits: Found by chong from OWL337.
Assertion '(object_p->u1.property_list_cp & ~JMEM_TAG_MASK) == 0' in ecma_gc_free_object
This is a GitHub Issue
repo:jerryscript
owner:jerryscript-project
Title : Assertion '(object_p->u1.property_list_cp & ~JMEM_TAG_MASK) == 0' in ecma_gc_free_object
Issue date:

--- start body ---


###### JerryScript revision
2faafa4


###### Build platform
Ubuntu 18.04.5 LTS(Linux 4.15.0-119-generic x86_64)

###### Build steps
```
./tools/build.py --clean --debug --compile-flag=-fsanitize=address \
--compile-flag=-m32 --compile-flag=-fno-omit-frame-pointer \
--compile-flag=-fno-common --compile-flag=-g --strip=off \
--system-allocator=on --logging=on --linker-flag=-fuse-ld=gold \
--error-messages=on --profile=es2015-subset  --builddir=$PWD/build

```


###### Test case
```
var obj1 = new Proxy({length: 2, 0: '', 1: ''}, { get: function(o, k) { get.push(k); return o[k]; }});
var weakset = new WeakSet();
weakset.add(obj1);

```

###### Output
```
ICE: Assertion '(object_p->u1.property_list_cp & ~JMEM_TAG_MASK) == 0' failed at /root/jerryscript/jerry-core/ecma/base/ecma-gc.c(ecma_gc_free_object):1655.
Error: ERR_FAILED_INTERNAL_ASSERTION
Aborted

```

Credits: Found by chong from OWL337.
--- end body ---
