[Bug lto/69607] undefined reference to MAIN__._omp_fn.0 in atomic_capture-1.f with -flto

["vries at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69607

vries at gcc dot gnu.org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
      Known to fail|                            |5.3.0, 6.0

--- Comment #20 from vries at gcc dot gnu.org ---
(In reply to vries from comment #19)
> > target-1.c
> > target-2.c
> 
> Managed to reproduce with intelmic offloading:
> ...
> $ ./lean-c-intelmic/install/host/bin/x86_64-pc-linux-gnu-gcc target-1.c
> target-2.c -fopenmp -flto -flto-partition=1to1 -fno-toplevel-reorder -O2
> -save-temps 
> /tmp/ccfMdK4z.ltrans0.ltrans.o:(.gnu.offload_vars+0x0): undefined reference
> to `tgtv'
> /tmp/ccfMdK4z.ltrans0.ltrans.o:(.gnu.offload_funcs+0x0): undefined reference
> to `fn2._omp_fn.0'
> /tmp/ccfMdK4z.ltrans0.ltrans.o:(.gnu.offload_funcs+0x8): undefined reference
> to `fn3._omp_fn.2'
> /tmp/ccfMdK4z.ltrans0.ltrans.o:(.gnu.offload_funcs+0x10): undefined
> reference to `fn4._omp_fn.4'
> collect2: error: ld returned 1 exit status
> ...

Reproduced on gcc-5-branch, and verified that proposed patch fixes it.

So, fails for 6.0 trunk and 5 branch, offloading not supported on 4.9 branch,
therefore not a release regression.