Memregion pool no handle (#26110)

Co-authored-by: SirOlaf <34164198+SirOlaf@users.noreply.github.com>
(cherry picked from commit 43f7631b1c)

lib/system/threadimpl.nim

@@ -19,6 +19,13 @@ when not defined(useNimRtl):
 
       threadType = ThreadType.NimThread
 
+when hasThreadLocalAllocator and not emulatedThreadVars:
+  proc setupForeignThreadGc*() {.gcsafe, raises: [].} =
+    initThreadAllocator()
+
+  proc tearDownForeignThreadGc*() {.gcsafe, raises: [].} =
+    releaseThreadAllocator()
+
 when defined(gcDestructors):
   proc deallocThreadStorage(p: pointer) = c_free(p)
 else:
@@ -79,6 +86,8 @@ else:
         deallocThreadStorage(thrd.rawStack)
 
 proc threadProcWrapStackFrame[TArg](thrd: ptr Thread[TArg]) {.raises: [].} =
+  when hasThreadLocalAllocator:
+    initThreadAllocator()
   when defined(boehmgc):
     boehmGC_call_with_stack_base(threadProcWrapDispatch[TArg], thrd)
   elif not defined(nogc) and not defined(gogc) and not defined(gcRegions) and not usesDestructors:
@@ -93,6 +102,8 @@ proc threadProcWrapStackFrame[TArg](thrd: ptr Thread[TArg]) {.raises: [].} =
     when declared(deallocOsPages): deallocOsPages()
   else:
     threadProcWrapDispatch(thrd)
+    when hasThreadLocalAllocator:
+      releaseThreadAllocator()
 
 template nimThreadProcWrapperBody*(closure: untyped): untyped =
   var thrd = cast[ptr Thread[TArg]](closure)