Convert trivial TopDown mutators to BottomUp

Many TopDown mutators can be easily converted to BottomUp mutators,
which are easier to handle for incremental and partial analysis.

Bug: 367784740
Test: all soong tests pass
Test: no change to build.ninja
Flag: EXEMPT refactor
Change-Id: I82955e844ed0eb6680854678c0744ac5398eb7ba
diff --git a/android/visibility.go b/android/visibility.go
index 89c0adc..61f2200 100644
--- a/android/visibility.go
+++ b/android/visibility.go
@@ -283,7 +283,7 @@
 
 // This must be registered after the deps have been resolved.
 func RegisterVisibilityRuleEnforcer(ctx RegisterMutatorsContext) {
-	ctx.TopDown("visibilityRuleEnforcer", visibilityRuleEnforcer).Parallel()
+	ctx.BottomUp("visibilityRuleEnforcer", visibilityRuleEnforcer).Parallel()
 }
 
 // Checks the per-module visibility rule lists before defaults expansion.
@@ -507,7 +507,7 @@
 	return true, pkg, name
 }
 
-func visibilityRuleEnforcer(ctx TopDownMutatorContext) {
+func visibilityRuleEnforcer(ctx BottomUpMutatorContext) {
 	qualified := createVisibilityModuleReference(ctx.ModuleName(), ctx.ModuleDir(), ctx.Module())
 
 	// Visit all the dependencies making sure that this module has access to them all.