ARM: Makefile/gyp update allowing better control of ARM specific options.

src/flags.cc

Index: src/flags.cc
diff --git a/src/flags.cc b/src/flags.cc
index a7fae681ae91d6bc173432521fa28088ad9ae4f9..282bf20ac4b3f1871e55b4b6aed4f5fed1b733ef 100644
--- a/src/flags.cc
+++ b/src/flags.cc
@@ -34,6 +34,9 @@
 #include "smart-pointers.h"
 #include "string-stream.h"
 
+#ifdef V8_TARGET_ARCH_ARM
+#include "arm/assembler-arm-inl.h"
+#endif
 
 namespace v8 {
 namespace internal {
@@ -517,6 +520,12 @@ void FlagList::ResetAllFlags() {
 
 // static
 void FlagList::PrintHelp() {
+#ifdef V8_TARGET_ARCH_ARM
+  CpuFeatures::PrintTarget();
+  CpuFeatures::Probe();
+  CpuFeatures::PrintFeatures();
+#endif  // V8_TARGET_ARCH_ARM
+
   printf("Usage:\n");
   printf("  shell [options] -e string\n");
   printf("    execute string in V8\n");