x86: Handle -mavx512vpopcntdq for -march=native

Add -mavx512vpopcntdq for -march=native if AVX512VPOPCNTDQ is available.

	PR target/95258
	* config/i386/driver-i386.c (host_detect_local_cpu): Detect
	AVX512VPOPCNTDQ.

(cherry picked from commit 808b611bfb4b05703ea174e50874c711dca44c98)

gcc/ChangeLog

+2020-05-24  H.J. Lu  <hongjiu.lu@intel.com>
+
+	PR target/95258
+	* config/i386/driver-i386.c (host_detect_local_cpu): Detect
+	AVX512VPOPCNTDQ.
+
 2020-05-22  Richard Biener  <rguenther@suse.de>
 
 	PR lto/95190

gcc/config/i386/driver-i386.c

@@ -420,6 +420,7 @@ const char *host_detect_local_cpu (int argc, const char **argv)
   unsigned int has_avx5124fmaps = 0, has_avx5124vnniw = 0;
   unsigned int has_gfni = 0, has_avx512vbmi2 = 0;
   unsigned int has_avx512bitalg = 0;
+  unsigned int has_avx512vpopcntdq = 0;
   unsigned int has_shstk = 0;
   unsigned int has_avx512vnni = 0, has_vaes = 0;
   unsigned int has_vpclmulqdq = 0;
@@ -526,6 +527,7 @@ const char *host_detect_local_cpu (int argc, const char **argv)
       has_vaes = ecx & bit_VAES;
       has_vpclmulqdq = ecx & bit_VPCLMULQDQ;
       has_avx512bitalg = ecx & bit_AVX512BITALG;
+      has_avx512vpopcntdq = ecx & bit_AVX512VPOPCNTDQ;
       has_movdiri = ecx & bit_MOVDIRI;
       has_movdir64b = ecx & bit_MOVDIR64B;
       has_enqcmd = ecx & bit_ENQCMD;
@@ -1156,6 +1158,7 @@ const char *host_detect_local_cpu (int argc, const char **argv)
       const char *vpclmulqdq = has_vpclmulqdq ? " -mvpclmulqdq" : " -mno-vpclmulqdq";
       const char *avx512vp2intersect = has_avx512vp2intersect ? " -mavx512vp2intersect" : " -mno-avx512vp2intersect";
       const char *avx512bitalg = has_avx512bitalg ? " -mavx512bitalg" : " -mno-avx512bitalg";
+      const char *avx512vpopcntdq = has_avx512vpopcntdq ? " -mavx512vpopcntdq" : " -mno-avx512vpopcntdq";
       const char *movdiri = has_movdiri ? " -mmovdiri" : " -mno-movdiri";
       const char *movdir64b = has_movdir64b ? " -mmovdir64b" : " -mno-movdir64b";
       const char *enqcmd = has_enqcmd ? " -menqcmd" : " -mno-enqcmd";
@@ -1176,9 +1179,9 @@ const char *host_detect_local_cpu (int argc, const char **argv)
 			avx512ifma, avx512vbmi, avx5124fmaps, avx5124vnniw,
 			clwb, mwaitx, clzero, pku, rdpid, gfni, shstk,
 			avx512vbmi2, avx512vnni, vaes, vpclmulqdq,
-			avx512bitalg, movdiri, movdir64b, waitpkg, cldemote,
-			ptwrite, avx512bf16, enqcmd, avx512vp2intersect,
-			NULL);
+			avx512bitalg, avx512vpopcntdq, movdiri, movdir64b,
+			waitpkg, cldemote, ptwrite, avx512bf16, enqcmd,
+			avx512vp2intersect, NULL);
     }
 
 done: