[ruby/bigdecimal] Avoid RB_GC_GUARD(a) = b in bigdecimal
https://github.com/ruby/bigdecimal/commit/7b2957922f
[ruby/bigdecimal] Avoid RB_GC_GUARD(a) = b in bigdecimal
set before RB_GC_GUARD() is called.
https://github.com/ruby/bigdecimal/commit/7b2957922f