ARMv7 ubfx support...

src/platform-linux.cc

Index: src/platform-linux.cc
===================================================================
--- src/platform-linux.cc	(revision 3799)
+++ src/platform-linux.cc	(working copy)
@@ -89,6 +89,8 @@
   // Here gcc is telling us that we are on an ARM and gcc is assuming that we
   // have VFP3 instructions.  If gcc can assume it then so can we.
   return 1u << VFP3;
+#elif CAN_USE_ARMV7_INSTRUCTIONS
+  return 1u << ARMv7;
 #else
   return 0;  // Linux runs on anything.
 #endif
@@ -113,6 +115,9 @@
     case VFP3:
       search_string = "vfp";
       break;
+    case ARMv7:
+      search_string = "ARMv7";
+      break;
     default:
       UNREACHABLE();
   }