Refactor sanitized library on-disk layout - Soong.

This CL moves the location of ASAN-ified libraries on disk in the
following manner:
/data/lib* --> /data/asan/system/lib*
/data/vendor/* --> /data/asan/vendor/*

There are a couple of advantages to this, including better isolation
from other components, and more transparent linker renaming and
SELinux policies.

Bug: 36574794
Bug: 36674745
Test: m -j40 && SANITIZE_TARGET="address" m -j40 and the device
boots. All sanitized libraries are correctly located in /data/asan/*.

Change-Id: I06bf459260ec451d4495a02562f640ad622f34c2

android/paths.go

@@ -652,7 +652,10 @@ func PathForModuleInstall(ctx ModuleContext, paths ...string) OutputPath {
 		if ctx.Proprietary() {
 			partition = ctx.DeviceConfig().VendorPath()
 		}
-		if ctx.InstallInData() {
+
+		if ctx.InstallInSanitizerDir() {
+			partition = "data/asan/" + partition
+		} else if ctx.InstallInData() {
 			partition = "data"
 		}
 		outPaths = []string{"target", "product", ctx.AConfig().DeviceName(), partition}