Segfaults for @code_llvm on generator internal function

[gasagna]

Hi,

This happened to me in the REPL while playing with generators:

   _       _ _(_)_     |  A fresh approach to technical computing
  (_)     | (_) (_)    |  Documentation: http://docs.julialang.org
   _ _   _| |_  __ _   |  Type "?help" for help.
  | | | | | | |/ _` |  |
  | | |_| | | | (_| |  |  Version 0.5.0-dev+4112 (2016-05-16 15:27 UTC)
 _/ |\__'_|_|_|\__'_|  |  Commit 97dc858 (0 days old master)
|__/                   |  x86_64-apple-darwin15.4.0

julia> f = (i for i in 1:10)
Base.Generator{UnitRange{Int64},##1#2}(#1,1:10)

julia> fieldnames(f)
2-element Array{Symbol,1}:
 :f   
 :iter

julia> f.f(1)
1

julia> f.f(2)
2

julia> @code_native f.f

signal (11): Segmentation fault: 11
while loading no file, in expression starting on line 0
emit_function at /Users/davide/Software/julia/src/codegen.cpp:4000
to_function at /Users/davide/Software/julia/src/codegen.cpp:832
jl_compile_linfo at /Users/davide/Software/julia/src/codegen.cpp:1027
jl_get_llvmf at /Users/davide/Software/julia/src/codegen.cpp:1161
_dump_function at ./reflection.jl:307
unknown function (ip: 0x31e6484ab)
jl_call_method_internal at /Users/davide/Software/julia/src/./julia_internal.h:76
jl_apply_generic at /Users/davide/Software/julia/src/gf.c:1602
code_native at ./reflection.jl:329
unknown function (ip: 0x31e64715d)
jl_call_method_internal at /Users/davide/Software/julia/src/./julia_internal.h:76
jl_apply_generic at /Users/davide/Software/julia/src/gf.c:1602
code_native at ./reflection.jl:331
unknown function (ip: 0x31e6450f6)
jl_call_method_internal at /Users/davide/Software/julia/src/./julia_internal.h:76
jl_apply_generic at /Users/davide/Software/julia/src/gf.c:1602
do_call at /Users/davide/Software/julia/src/interpreter.c:58
eval at /Users/davide/Software/julia/src/interpreter.c:174
jl_interpret_toplevel_expr at /Users/davide/Software/julia/src/interpreter.c:25
jl_toplevel_eval_flex at /Users/davide/Software/julia/src/toplevel.c:545
jl_toplevel_eval at /Users/davide/Software/julia/src/toplevel.c:567
jl_toplevel_eval_in_warn at /Users/davide/Software/julia/src/builtins.c:547
jl_toplevel_eval_in at /Users/davide/Software/julia/src/builtins.c:514
eval at ./boot.jl:226
jlcall_eval_17886 at /Users/davide/Software/julia/usr/lib/julia/sys-debug.dylib (unknown line)
jl_call_method_internal at /Users/davide/Software/julia/src/./julia_internal.h:76
jl_apply_generic at /Users/davide/Software/julia/src/gf.c:1602
[inline] at ./REPL.jl:3
eval_user_input at ./REPL.jl:62
unknown function (ip: 0x31e5fb586)
jl_call_method_internal at /Users/davide/Software/julia/src/./julia_internal.h:76
jl_apply_generic at /Users/davide/Software/julia/src/gf.c:1602
[inline] at ./REPL.jl:92
#1 at ./event.jl:46
unknown function (ip: 0x3112c452f)
jl_call_method_internal at /Users/davide/Software/julia/src/./julia_internal.h:76
jl_apply_generic at /Users/davide/Software/julia/src/gf.c:1602
jl_apply at /Users/davide/Software/julia/src/./julia.h:1386
start_task at /Users/davide/Software/julia/src/task.c:253
Allocations: 2526698 (Pool: 2525566; Big: 1132); GC: 4
Segmentation fault: 11

[KristofferC]

#15606 maybe?

[yuyichao]

Dup of #15606