beam_block: Remove a clause that will never be executed

Since the introduction of literals in R12B, empty tuples
are literals. Thus the put_tuple/2 instruction is always
followed by at least one put/1 instruction. Therefore
the alloc_may_pass/1 function in beam_block no longer needs
a clause for for "put_tuple", because the clause for "put"
will always be reached first (since the instruction stream
is scanned in reverse execution order).

Note that if the compiler would generate a "put_tuple 0 Dst"
instruction for some unfathomable reason, we should still be
because  the run-time system will now refuse to load a module
containing such an instruction.

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