Merge pull request #39336 from JuliaLang/jb/finalizerenabletest

fix failing `enable_finalizers` test

Author: vchuravy

test/misc.jl

@@ -149,7 +149,10 @@ for l in (Threads.SpinLock(), ReentrantLock())
     @test get_finalizers_inhibited() == 1
     GC.enable_finalizers(true)
     @test get_finalizers_inhibited() == 0
-    @test_warn "WARNING: GC finalizers already enabled on this thread." GC.enable_finalizers(true)
+    if ccall(:jl_is_debugbuild, Cint, ()) != 0
+        # Note this warning only exists in debug builds
+        @test_warn "WARNING: GC finalizers already enabled on this thread." GC.enable_finalizers(true)
+    end
 
     @test lock(l) === nothing
     @test try unlock(l) finally end === nothing