[Bug ipa/81214] GCC target_clone support does not work for global functions with no references

[dominiq at lps dot ens.fr]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81214

--- Comment #6 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
At revision r249851 I see the following regression on darwin

FAIL: gcc.target/i386/mvc6.c (test for excess errors)
UNRESOLVED: gcc.target/i386/mvc6.c scan-assembler punpcklbw
UNRESOLVED: gcc.target/i386/mvc6.c scan-assembler vpshufb

% gcc8 -c -O3 /opt/gcc/_clean/gcc/testsuite/gcc.target/i386/mvc6.c
/opt/gcc/_clean/gcc/testsuite/gcc.target/i386/mvc6.c:8:1: error: the call
requires ifunc, which is not supported by this target
 foo(char *in, char *out, int size)
 ^~~

I suspect this to be caused by revision r249840.