[Bug target/97148] New: Add <intintrin.h>

[hjl.tools at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97148

            Bug ID: 97148
           Summary: Add <intintrin.h>
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: hjl.tools at gmail dot com
                CC: crazylht at gmail dot com
  Target Milestone: ---

<x86intrin.h> is always usable.  libgcc/config/i386/shadow-stack-unwind.h has

/* NB: We need _get_ssp and _inc_ssp from <cetintrin.h>.  But we can't
   include <x86intrin.h> which ends up including <mm_malloc.h>, which
   includes <stdlib.h> and <errno.h> unconditionally.  But we can't
   include any libc system headers unconditionally from libgcc.  Avoid
   including <mm_malloc.h> here by defining _IMMINTRIN_H_INCLUDED.  */
#define _IMMINTRIN_H_INCLUDED
#include <cetintrin.h>
#undef _IMMINTRIN_H_INCLUDED

We should add <intintrin.h> for integer only intrinsics.