code coverage breaks inline_const pass

[Roger-luo]

currently, the test will fail when running test with julia --project --code-coverage. this is because the inserted Expr(:code_coverage_effect) somehow breaks it. to reproduce the problem, run following with julia --project --code-coverage:

using YaoCompiler

qasm"""OPENQASM 2.0;
include "test/compiler/qelib1.inc";

gate post q {x q;}
"""

@device function circuit()
           1:3 => ccx()
           (2, 3) => cx()
           2 => h()
           c = @measure 1
           if c == 1
               3 => post()
           end
           3 => rx(1.0)
           return (c=c, )
end

ci, = @code_yao optimize = true circuit()

and you will see

julia> ci.code[94]
:(%new(RoutineSpec{GenericRoutine{:tdg}, Tuple{}}, %90, ()))

where %90 is Main.tdg which is a constant, so %94 should be a constant too, but it isn't. I guess I need your help on this again @vchuravy I find out how to fix it in #11