go/ssa: temporarily skip the 'net' package in TestStdlib

Following CL 465836, go/ssa panics on the net package. Skip it for now
to unbreak the longtest builders.

I thought I may need to skip the reverse transitive cone of net, but
simply skipping the net package appears to fix the failing test.

For golang/go#58491

Change-Id: Id2fb898ba2867ecf70311ab8945ac6330dbffb0a
Reviewed-on: https://go-review.googlesource.com/c/tools/+/467676
Reviewed-by: Bryan Mills <[email protected]>
Run-TryBot: Robert Findley <[email protected]>
TryBot-Result: Gopher Robot <[email protected]>
gopls-CI: kokoro <[email protected]>

Author: findleyr

go/ssa/stdlib_test.go

@@ -50,6 +50,18 @@ func TestStdlib(t *testing.T) {
 		t.Fatal(err)
 	}
 
+	// TODO(golang/go#58491): fix breakage on new generic code in net.
+	//
+	// For now, exclude the 'net' package.
+	netIdx := -1
+	for i, pkg := range pkgs {
+		if pkg.PkgPath == "net" {
+			netIdx = i
+			break
+		}
+	}
+	pkgs = append(pkgs[:netIdx], pkgs[netIdx+1:]...)
+
 	t1 := time.Now()
 	alloc1 := bytesAllocated()