set module flags

Author: vchuravy

src/core/module.jl

@@ -176,3 +176,9 @@ function Base.getindex(iter::ModuleFunctionSet, name::String)
     objref == C_NULL && throw(KeyError(name))
     return Function(objref)
 end
+
+# flags
+if libllvm_version >= v"8.0.0"
+addflag!(mod::Module, behavior, key, val) = LLVM.API.LLVMAddModuleFlag(ref(mod), behavior, key, length(key), LLVM.ref(Metadata(val)))
+
+end