Add `Exception::CallStack.empty` #3986

Job	Run time
Build interpreter	9m 52s
Build interpreter	9m 52s
Test Interpreter	19s
Test Interpreter	4m 12s
Test std_spec with interpreter (0)	2m 3s
Test std_spec with interpreter (0)	2m 3s
Test std_spec with interpreter (1)	3m 0s
Test std_spec with interpreter (1)	3m 0s
Test std_spec with interpreter (2)	2m 54s
Test std_spec with interpreter (2)	2m 54s
Test primitives_spec with interpreter	27s
Test primitives_spec with interpreter	27s
Test std_spec with interpreter (3)	3m 9s
Test std_spec with interpreter (3)	3m 9s
	47m 21s

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