Some clarifications in preparation to automatically order linker dependencies

Test: Browse the code and determine whether it's easier to understand
Bug: 66260943
Change-Id: I88c24a8a31ef68f428919087d206433659265684
diff --git a/cc/sanitize.go b/cc/sanitize.go
index 090d490..b8b5ffa 100644
--- a/cc/sanitize.go
+++ b/cc/sanitize.go
@@ -128,7 +128,7 @@
 	s := &sanitize.Properties.Sanitize
 
 	// Don't apply sanitizers to NDK code.
-	if ctx.sdk() {
+	if ctx.useSdk() {
 		s.Never = true
 	}
 
@@ -421,7 +421,7 @@
 
 		// When linking against VNDK, use the vendor variant of the runtime lib
 		sanitize.androidMkRuntimeLibrary = sanitize.runtimeLibrary
-		if ctx.vndk() {
+		if ctx.useVndk() {
 			sanitize.androidMkRuntimeLibrary = sanitize.runtimeLibrary + vendorSuffix
 		}
 	}