merge revision(s) 39625,39626: [Backport #8008]

	compile.c: calc in int

	* compile.c (iseq_compile_each): calculate argc as int, not as Fixnum.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_0_0@39917 b2dd03c8-39d4-4d8f-98ff-823fe69b080e