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Don't register non-heap allocated objects
`rb_define_const` can add objects as "mark objects". This is to make code like this work: https://github.com/ruby/ruby/blob/33d6e92e0c6eaf1308ce7108e653c53bb5fb106c/ext/etc/etc.c#L1201 ``` rb_define_const(rb_cStruct, "Passwd", sPasswd); /* deprecated name */ ``` sPasswd is a heap allocated object that is also a C global, so we can't move it (it needs to be pinned). However, we have many calls to `rb_define_const` that just pass in an integer like this: ``` rb_define_const(rb_cDBM, "WRITER", INT2FIX(O_RDWR|RUBY_DBM_RW_BIT)); ``` Non heap allocated objects like integers will never move, so there is no reason to waste time in the GC marking / pinning them.
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