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Add MRB_ALLOCV() for temporary memory allocation #4853

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Add MRB_ALLOCV() for temporary memory allocation #4853

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Commits on Dec 6, 2019

  1. Add MRB_ALLOCV() for temporary memory allocation 

    `MRB_ALLOCV(mrb, type, var, n)` defines `type *var` variable and assign
temporarily allocated memory for _n_ objects of type _type_. If the
allocation size is less than or equal to `MRB_ALLOCV_ON_STACK_MAX`, allocate
on the stack, otherwise use `mrb_alloca()`.

`MRB_ALLOCV_ON_STACK_MAX` is configurable in `mrbconf.h` (default is 256).
    @shuujii
    shuujii committed Dec 6, 2019
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