fix test and gcroot that was broken by jb/functions

src/codegen.cpp

@@ -3031,6 +3031,7 @@ static jl_cgval_t emit_call(jl_value_t **args, size_t arglen, jl_codectx_t *ctx,
                 else {
                     fval = emit_expr(args[0], ctx);
                 }
+                jl_add_linfo_root(ctx->linfo, (jl_value_t*)li);
                 result = emit_call_function_object(li, fval, theFptr, args, nargs, expr, ctx);
                 ctx->gc.argDepth = argStart;
                 JL_GC_POP();

test/core.jl

@@ -3547,7 +3547,7 @@ let i = Any[[1.23], [2.34]]
     # f() with capture variables
     # Intentionally type unstable so that the dynamic dispatch will
     # read the corrupted tag if the object is incorrectly GC'd.
-    global f() = i[1][1] * i[2][1]
+    global @noinline f() = i[1][1] * i[2][1]
 end
 
 # Another function that use f()
@@ -3557,7 +3557,7 @@ g()
 
 let i = 9.0
     # Override f()
-    global f() = i + 1
+    global @noinline f() = i + 1
 end
 
 # Make sure the old f() method is GC'd if it was not rooted properly