to infinite. backported from 1.9.
* ext/bigdecimal/bigdecimal.c (VpIsRoundMode): rounding mode
condition check updated. backported from 1.9.
* ext/bigdecimal/bigdecimal.c (VpPower): should handle NaN and
Inf. backported from 1.9.
* ext/bigdecimal/bigdecimal.c (BigDecimal_DoDivmod): divmod should
raise ZeroDivisionError. backported from 1.9.
* ext/bigdecimal/bigdecimal.c (BigDecimal_mode): should check
exception for VP_EXCEPTION_UNDERFLOW and VP_EXCEPTION_ZERODIVIDE.
backported from 1.9.
* ext/bigdecimal/bigdecimal.c (VpException): ditto.
* ext/bigdecimal/bigdecimal.h (VP_EXCEPTION_ZERODIVIDE): new error
code. backported from 1.9.
* ext/bigdecimal/bigdecimal.c (BigDecimal_div2, BigDecimal_round,
BigDecimal_truncate, BigDecimal_floor, BigDecimal_ceil): eagerly convert
bigdecimal to integer. backported from 1.9.
* ext/bigdecimal/bigdecimal.c (VpMult): free internal Real.
backported from 1.9.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_8@23664 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
