target.h (htm_available): Add support for PPC_FEATURE2_HTM_NO_SUSPEND.

libitm/
	* config/powerpc/target.h (htm_available):  Add support for
	PPC_FEATURE2_HTM_NO_SUSPEND.  Use __builtin_cpu_supports if available.

From-SVN: r267101

libitm/ChangeLog

+2018-12-13  Peter Bergner  <bergner@linux.ibm.com>
+
+	* config/powerpc/target.h (htm_available):  Add support for
+	PPC_FEATURE2_HTM_NO_SUSPEND.  Use __builtin_cpu_supports if available.
+
 2018-10-31  Joseph Myers  <joseph@codesourcery.com>
 
 	PR bootstrap/82856

libitm/config/powerpc/target.h

@@ -81,7 +81,20 @@ cpu_relax (void)
 static inline bool
 htm_available (void)
 {
-  return (getauxval (AT_HWCAP2) & PPC_FEATURE2_HAS_HTM) ? true : false;
+#ifdef __BUILTIN_CPU_SUPPORTS__
+  if (__builtin_cpu_supports ("htm-no-suspend")
+      || __builtin_cpu_supports ("htm"))
+    return true;
+#else
+  unsigned long htm_flags = PPC_FEATURE2_HAS_HTM
+#ifdef PPC_FEATURE2_HTM_NO_SUSPEND
+			    | PPC_FEATURE2_HTM_NO_SUSPEND
+#endif
+			    | 0;
+  if (getauxval (AT_HWCAP2) & htm_flags)
+    return true;
+#endif
+  return false;
 }
 
 static inline uint32_t