[Bug lto/71535] New: ICE in LTO1 with -fopenmp offloading

["bisqwit at iki dot fi" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71535

            Bug ID: 71535
           Summary: ICE in LTO1 with -fopenmp offloading
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: lto
          Assignee: unassigned at gcc dot gnu.org
          Reporter: bisqwit at iki dot fi
  Target Milestone: ---

With this example program:

#include <algorithm>

void Process(unsigned* Target)
{
    for(int s=0; s<4; ++s)
        Target[s] = 100u * std::min(255, std::max(0, 0))
                 +  200u * std::min(255, std::max(0, 0));
}

int main()
{
    #pragma omp target teams distribute parallel for
    for(unsigned y=0; y<16; ++y)
    {
        unsigned Line[16];
        Process(Line);
    }
}

g++ tmps.cc -fopenmp

lto1: internal compiler error: in input_overwrite_node, at lto-cgraph.c:1203
0x82f4d5 input_overwrite_node
        ../../gcc/lto-cgraph.c:1201
0x82f4d5 input_node
        ../../gcc/lto-cgraph.c:1296
0x82f4d5 input_cgraph_1
        ../../gcc/lto-cgraph.c:1546
0x82f4d5 input_symtab()
        ../../gcc/lto-cgraph.c:1849
0x5c657b read_cgraph_and_symbols
        ../../gcc/lto/lto.c:2856
0x5c657b lto_main()
        ../../gcc/lto/lto.c:3304
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <http://gcc.gnu.org/bugs.html> for instructions.
mkoffload-intelmic: fatal error:
x86_64-pc-linux-gnu-accel-x86_64-intelmicemul-linux-gnu-gcc returned 1 exit
status
compilation terminated.
lto-wrapper: fatal error:
/usr/local/libexec/gcc/x86_64-pc-linux-gnu/6.1.0//accel/x86_64-intelmicemul-linux-gnu/mkoffload
returned 1 exit status
compilation terminated.
/usr/bin/ld: error: lto-wrapper failed
collect2: error: ld returned 1 exit status

GCC version: 6.1.0
This bug is very likely related to PR71499.