NFC: encapsulate write barrier fast path emission into a single function #55156
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Third-party GCs (e.g. MMTk) will have their own write barrier fast path logic (e.g. may use different bit patterns to define what are young & old objects, etc.).
Let's encapsulate the write-barrier fast emission code into a single function to make more explicit what parts of the
late-gc-loweringcode must be re-implemented when porting these third-party GCs into Julia.