Order dependent crash with precompile in 0.4.3

[mdcfrancis]

Reproduction, in a clean Julia 0.4.3 install

Pkg.generate("Foo", "MIT" )
Pkg.generate("Bar", "MIT" )

edit Foo.jl to

 __precompile__()
 module Foo
 using Bar
 # package code goes here
 end # module

now do

using Bar
...
using Foo
...
  WARNING: Module Bar uuid did not match cache file
  ERROR: __precompile__(true) but require failed to create a precompiled cache file
   in require at ./loading.jl:257

clean the lib directory

using Foo
using Bar 

all good, exit come back in

using Bar
using Foo

all good

[yuyichao]

Dup of #13200

[yuyichao]

The repro looks interesting. Will check if it is more deterministic.

[mdcfrancis]

This repro happens 100% of the time and is just a few lines of code. The issue is specifically caused by a child module not having precompile() in a module which does.