Even if you can't use something like Fil-C in your release/production builds, being able to e.g. compile unit tests with it to catch memory safety bugs is a huge win. My team use gcc for its mips codegen, but I'm working on adopting the clang bounds-safety annotations for test builds for exactly this reason.
Yeah, I haven't yet taken a serious look into it from that perspective yet, but similar came to mind; while, outside of bootstrapping the JDK from GCJ, Boehm GC hasn't been super relevant to me for "release" builds of anything, it's been useful in leak detection mode on occasion.
I figure even if you cannot use, or do not want to use, something like Fil-C in production, there's solid potential for it to augment whatever existing suite of sanitizers and other tools that one may already build against.
