[pull] master from ruby:master#1121
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In many place ALLOC_V / ALLOCV_N is used as a safer `alloca`, and to behave like stack memory, `ALLOCV` does scan its buffer for references using `rb_gc_mark_locations`. The problem is that it's quite slow, and in many cases, the temporary buffer is known not to contain any references. e.g. `ALLOCV_N(uint32_t, buf0, len)` can't possibly contain references, as the element size is too small.
Add `test_opt_plus_overflow` and `test_opt_minus_overflow`, verifying that `Fixnum + Fixnum` and `Fixnum - Fixnum` side exit on overflow, seems like test_opt_mult_overflow.
In the past this used an ad-hoc weakref implementation that required checking whether the referenced object was about to be swept. We replaced this with the actual weakref implementation from the GC so these VALUEs should always be either live or Qundef.
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