Detect EAF flags in ipa-modref

[Jan Hubicka]

> This breaks bootstrap with go.
> 
> ../../gcc/go/gofrontend/go-diagnostics.cc: In function 'std::string expand_message(const char*, va_list)':
> ../../gcc/go/gofrontend/go-diagnostics.cc:110:61: error: '<anonymous>' may be used uninitialized [-Werror=maybe-uninitialized]
>   110 |                      "memory allocation failed in vasprintf");
>       |                                                             ^

Well, this may be simply a false positive (except that the warning is
clearly mislocalted and cryptic) I was bootstrapping with go just few
minutes ago, so I wonder what configure flags you use?

Honza
> 
> Andreas.
> 
> -- 
> Andreas Schwab, schwab@linux-m68k.org
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