vm_call_symbol: check stack overflow

VM stack could overflow here.  The condition is when a symbol is passed
to a block-taking method via &variable, and that symbol has never been
used for actual method names (thus yielding that results in calling
method_missing), and the VM stack is full (no single word left).  This
is a once-in-a-blue-moon event.  Yet there is a very tiny room of stack
overflow.  We need to check that.

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