std/hashes: hash(ref|ptr|pointer) + other improvements (#17731)

tests/stdlib/tstrutils.nim

@@ -3,7 +3,7 @@ discard """
 """
 
 import std/strutils
-
+from stdtest/testutils import disableVm
 # xxx each instance of `disableVm` and `when not defined js:` should eventually be fixed
 
 template rejectParse(e) =
@@ -12,10 +12,6 @@ template rejectParse(e) =
     raise newException(AssertionDefect, "This was supposed to fail: $#!" % astToStr(e))
   except ValueError: discard
 
-template disableVm(body) =
-  when nimvm: discard
-  else: body
-
 template main() =
   block: # strip
     doAssert strip("  ha  ") == "ha"