This CL blocks modules intended for the host from having the bottom up
sanitizer mutator applied. We only maintain a single copy of host
binaries, so generating variants doesn't make sense
anyway. Additionally, the existing logic was causing an error with
builds not embedded in make (eg: aosp-build-tools which uses
soong_ui.bash) where the wrong variant was installed on the host. This
change should fix that.
Bug: 64536751
Test: m -j40 && SANITIZE_TARGET="address" m -j40
Test: aosp-build-tools build breakage is fixed.
Change-Id: Ia79b4661f69ce26a7be17c4339c18ca0f397d760