[Arm]: Simplify compile-time Arm feature detection.

src/flags.cc

 // Copyright 2006-2008 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <ctype.h>
 #include <stdlib.h>
 
 #include "src/v8.h"
 
 #include "src/assembler.h"
@@ skipping 499 matching lines @@
 // static
 void FlagList::ResetAllFlags() {
   for (size_t i = 0; i < num_flags; ++i) {
     flags[i].Reset();
   }
 }
 
 
 // static
 void FlagList::PrintHelp() {
+  CpuFeatures::Probe(false);
   CpuFeatures::PrintTarget();
   CpuFeatures::PrintFeatures();
 
   printf("Usage:\n");
   printf("  shell [options] -e string\n");
   printf("    execute string in V8\n");
   printf("  shell [options] file1 file2 ... filek\n");
   printf("    run JavaScript scripts in file1, file2, ..., filek\n");
   printf("  shell [options]\n");
   printf("  shell [options] --shell [file1 file2 ... filek]\n");
@@ skipping 13 matching lines @@
 
 
 // static
 void FlagList::EnforceFlagImplications() {
 #define FLAG_MODE_DEFINE_IMPLICATIONS
 #include "src/flag-definitions.h"
 #undef FLAG_MODE_DEFINE_IMPLICATIONS
 }
 
 } }  // namespace v8::internal