treat host effect params as erased generics in codegen

This fixes the changes brought to codegen tests when effect params are
added to libcore, by not attempting to monomorphize functions that get
the host param by being `const fn`.

compiler/rustc_codegen_llvm/src/debuginfo/mod.rs

@@ -349,6 +349,7 @@ impl<'ll, 'tcx> DebugInfoMethods<'tcx> for CodegenCx<'ll, 'tcx> {
         type_names::push_generic_params(
             tcx,
             tcx.normalize_erasing_regions(ty::ParamEnv::reveal_all(), args),
+            enclosing_fn_def_id,
             &mut name,
         );