backport 1.10: create phantom task for GC threads (#53815) #54632
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A common idiom used throughout the codebase is to get a pointer to thread-local-state through
jl_current_task->ptls
.Create a phantom task for GC threads so that we can make use of this idiom when running in the GC threads as well.
Idea originally suggested by @vchuravy, bugs are mine.
(cherry picked from commit 9636ef7)