Use Base.process_status(p) instead of p.exitcode in error message (#57460)

Fixup #57455

Author: kpamnany

base/loading.jl

@@ -3288,7 +3288,7 @@ function compilecache(pkg::PkgId, path::String, internal_stderr::IO = stderr, in
     if p.exitcode == 125
         return PrecompilableError()
     else
-        error("Failed to precompile $(repr("text/plain", pkg)) to $(repr(tmppath)) (exit code $(p.exitcode)).")
+        error("Failed to precompile $(repr("text/plain", pkg)) to $(repr(tmppath)) ($(Base.process_status(p))).")
     end
 end