instruction. for example, at the following script
def m()
p:xyzzy
1
2
end
compiler ignores `1' because there is no effect. However,
`trace(line)' instruction remains in bytecode.
This modification removes such redundant trace(line) instruction.
* test/ruby/test_iseq.rb: add a test.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@39539 b2dd03c8-39d4-4d8f-98ff-823fe69b080e