[Bug c++/68383] Demangler stack overflow

[ian at airs dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68383

--- Comment #5 from Ian Lance Taylor <ian at airs dot com> ---
Thanks for the test case.  Which version of GCC are you using to compile?  When
I try to compile the test case I get

/usr/lib/gcc/x86_64-pc-linux-gnu/4.9.3/include/avx512fintrin.h: In function
‘__m512i _mm512_set1_epi64(long long int)’:
/usr/lib/gcc/x86_64-pc-linux-gnu/4.9.3/include/avx512fintrin.h:3631:25: error:
‘__builtin_ia32_pbroadcastq512_mem_mask’ was not declared in this scope
/usr/lib/gcc/x86_64-pc-linux-gnu/4.9.3/include/avx512fintrin.h: In function
‘__m512i _mm512_mask_set1_epi64(__m512i, __mmask8, long long int)’:
/usr/lib/gcc/x86_64-pc-linux-gnu/4.9.3/include/avx512fintrin.h:3644:14: error:
‘__builtin_ia32_pbroadcastq512_mem_mask’ was not declared in this scope
/usr/lib/gcc/x86_64-pc-linux-gnu/4.9.3/include/avx512fintrin.h: In function
‘__m512i _mm512_maskz_set1_epi64(__mmask8, long long int)’:
/usr/lib/gcc/x86_64-pc-linux-gnu/4.9.3/include/avx512fintrin.h:3661:11: error:
‘__builtin_ia32_pbroadcastq512_mem_mask’ was not declared in this scope


The version of avx512fintrin.h on mainline does not seem to call the function
__builtin_ia32_pbroadcastq512_mem_mask.