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Re:Crystal: Fast as C, Slick as Ruby by dikaiosune on Thursday August 04, 2016 @11:29AM (#12226171)
The Boehm collector (http://www.hboehm.info/gc/) appears to offer what you're describing. In fact, it looks like it's what Crystal added in 2013 to implement its original garbage collection:

https://crystal-lang.org/2013/12/05/garbage-collector.html

Re:Crystal: Fast as C, Slick as Ruby by exDM69 on Thursday August 04, 2016 @11:35AM (#12226210)
I'm familiar with it but it's not at all what I'm looking for. It's a library to "retrofit" GC into a C or other native program.

I'm looking for something to plug into LLVM's GC mechanisms to be used for new languages.