x86: Add FEATURE_AVX512VP2INTERSECT and update GFNI check

Add FEATURE_AVX512VP2INTERSECT to libgcc so that enum processor_features
in libgcc matches enum processor_features in i386-builtins.c.  Update
GFNI check to support processors with SSE and AVX versions of GFNI.

	Backport from master
	PR target/95212
	PR target/95220
	* config/i386/cpuinfo.c (get_available_features): Fix
	FEATURE_GFNI check.  Also check FEATURE_AVX512VP2INTERSECT.
	* config/i386/cpuinfo.h (processor_features): Add
	FEATURE_AVX512VP2INTERSECT.

libgcc/ChangeLog

+2020-05-19  H.J. Lu  <hongjiu.lu@intel.com>
+
+	Backport from master
+	2020-05-19  H.J. Lu  <hongjiu.lu@intel.com>
+
+	PR target/95212
+	PR target/95220
+	* config/i386/cpuinfo.c (get_available_features): Fix
+	FEATURE_GFNI check.  Also check FEATURE_AVX512VP2INTERSECT.
+	* config/i386/cpuinfo.h (processor_features): Add
+	FEATURE_AVX512VP2INTERSECT.
+
 2020-05-07  Release Manager
 
 	* GCC 10.1.0 released.

libgcc/config/i386/cpuinfo.c

@@ -349,6 +349,8 @@ get_available_features (unsigned int ecx, unsigned int edx,
 	}
       if (ebx & bit_BMI2)
 	set_feature (FEATURE_BMI2);
+      if (ecx & bit_GFNI)
+	set_feature (FEATURE_GFNI);
       if (avx512_usable)
 	{
 	  if (ebx & bit_AVX512F)
@@ -371,8 +373,6 @@ get_available_features (unsigned int ecx, unsigned int edx,
 	    set_feature (FEATURE_AVX512VBMI);
 	  if (ecx & bit_AVX512VBMI2)
 	    set_feature (FEATURE_AVX512VBMI2);
-	  if (ecx & bit_GFNI)
-	    set_feature (FEATURE_GFNI);
 	  if (ecx & bit_VPCLMULQDQ)
 	    set_feature (FEATURE_VPCLMULQDQ);
 	  if (ecx & bit_AVX512VNNI)
@@ -385,6 +385,8 @@ get_available_features (unsigned int ecx, unsigned int edx,
 	    set_feature (FEATURE_AVX5124VNNIW);
 	  if (edx & bit_AVX5124FMAPS)
 	    set_feature (FEATURE_AVX5124FMAPS);
+	  if (edx & bit_AVX512VP2INTERSECT)
+	    set_feature (FEATURE_AVX512VP2INTERSECT);
 
 	  __cpuid_count (7, 1, eax, ebx, ecx, edx);
 	  if (eax & bit_AVX512BF16)

libgcc/config/i386/cpuinfo.h

@@ -122,6 +122,7 @@ enum processor_features
   FEATURE_VPCLMULQDQ,
   FEATURE_AVX512VNNI,
   FEATURE_AVX512BITALG,
+  FEATURE_AVX512VP2INTERSECT,
   FEATURE_AVX512BF16
 };