ARM: update defaults for flags

src/flag-definitions.h

Index: src/flag-definitions.h
diff --git a/src/flag-definitions.h b/src/flag-definitions.h
index 47d87eaa50a044426cb446bb451c49d7bed6d3e0..ecf8ddc7615b307c1e00631dd7e5775eb20cd2d3 100644
--- a/src/flag-definitions.h
+++ b/src/flag-definitions.h
@@ -120,6 +120,11 @@ struct MaybeBoolFlag {
 #else
 # define ENABLE_32DREGS_DEFAULT false
 #endif
+#if (defined CAN_USE_NEON) || !(defined ARM_TEST)
+# define ENABLE_NEON_DEFAULT true
+#else
+# define ENABLE_NEON_DEFAULT false
+#endif
 
 #define DEFINE_bool(nam, def, cmt)   FLAG(BOOL, bool, nam, def, cmt)
 #define DEFINE_maybe_bool(nam, cmt)  FLAG(MAYBE_BOOL, MaybeBoolFlag, nam,  \
@@ -370,7 +375,7 @@ DEFINE_bool(enable_vfp3, ENABLE_VFP3_DEFAULT,
             "enable use of VFP3 instructions if available")
 DEFINE_bool(enable_armv7, ENABLE_ARMV7_DEFAULT,
             "enable use of ARMv7 instructions if available (ARM only)")
-DEFINE_bool(enable_neon, true,
+DEFINE_bool(enable_neon, ENABLE_NEON_DEFAULT,
             "enable use of NEON instructions if available (ARM only)")
 DEFINE_bool(enable_sudiv, true,
             "enable use of SDIV and UDIV instructions if available (ARM only)")