Merge "Add MALLOC_LOW_MEMORY as synonym for MALLOC_SVELTE." into main am: 8e46fa38 am: c0a91f80

Original change: https://android-review.googlesource.com/c/platform/build/+/3064404



Change-Id: I5d18de5a81027bd07735465e4d9c84689cc82028
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>