hotcodereloading compile error with orc/arc

[n0bra1n3r]

--hotcodereloading:on and --gc:orc causes a compile error on Windows on latest devel and 1.4.8. A similar error message is printed if --define:useNimRtl is passed instead of --hotcodereloading. Compilation works with the traditional GC.

Example

nim.exe c --hotcodereloading:on --gc:orc main.nim

Output

C:\Users\User\.choosenim\toolchains\nim-#devel\lib\system\mmdisp.nim(86, 25) template/generic instantiation of `instantiateForRegion` from here
C:\Users\User\.choosenim\toolchains\nim-#devel\lib\system\alloc.nim(1028, 3) Error: redefinition of 'deallocOsPages'; previous declaration here: C:\Users\User\.choosenim\toolchains\nim-#devel\lib\system\threads.nim(112, 8)
The terminal process "C:\Users\User\.nimble\bin\nim.exe 'check', '--errorMax:1', 'main.nim'" terminated with exit code: 1.

Expected Output

Successful compile.

Nim Compiler Version 1.5.1 [Windows: amd64]
Compiled at 2021-06-29
Copyright (c) 2006-2021 by Andreas Rumpf

active boot switches: -d:release
# Nim 2021-06-29-devel-6387e289631c22b8fa81e8e478c97cc500b90e26

[ringabout]

Related
#16458