Set regs to stack on return of const_get calls before use
Merge pull request #1538 from carsonmcdonald/conststackfix

Set regs to stack on return of const_get calls before use
move declarations to the beginning of blocks
Fixnum#succ may overflow
implement Integer#succ in Ruby
implement some Numeric methods in Ruby
move some methods to make floats and integers compatible [mruby special]
modify upto/downto for compatibility