Switch code generation on ARM from softfp ABI to hardfp ABI.

runtime/vm/runtime_entry.h

Index: runtime/vm/runtime_entry.h
===================================================================
--- runtime/vm/runtime_entry.h	(revision 23860)
+++ runtime/vm/runtime_entry.h	(working copy)
@@ -23,19 +23,19 @@
 class RuntimeEntry : public ValueObject {
  public:
   RuntimeEntry(const char* name, RuntimeFunction function,
-               int argument_count, bool is_leaf)
-  // TODO(regis): In order to simulate leaf runtime calls taking floating point
-  // arguments, we need to add an 'is_float' flag.
+               int argument_count, bool is_leaf, bool is_float)
       : name_(name),
         function_(function),
         argument_count_(argument_count),
-        is_leaf_(is_leaf) { }
+        is_leaf_(is_leaf),
+        is_float_(is_float) { }
   ~RuntimeEntry() {}
 
   const char* name() const { return name_; }
   RuntimeFunction function() const { return function_; }
   int argument_count() const { return argument_count_; }
   bool is_leaf() const { return is_leaf_; }
+  bool is_float() const { return is_float_; }
   uword GetEntryPoint() const { return reinterpret_cast<uword>(function()); }
 
   // Generate code to call the runtime entry.
@@ -46,6 +46,7 @@
   const RuntimeFunction function_;
   const int argument_count_;
   const bool is_leaf_;
+  const bool is_float_;
 
   DISALLOW_COPY_AND_ASSIGN(RuntimeEntry);
 };
@@ -56,7 +57,7 @@
 #define DEFINE_RUNTIME_ENTRY(name, argument_count)                             \
   extern void DRT_##name(NativeArguments arguments);                           \
   extern const RuntimeEntry k##name##RuntimeEntry(                             \
-      "DRT_"#name, &DRT_##name, argument_count, false);                        \
+      "DRT_"#name, &DRT_##name, argument_count, false, false);                 \
   static void DRT_Helper##name(Isolate* isolate, NativeArguments arguments);   \
   void DRT_##name(NativeArguments arguments) {                                 \
     CHECK_STACK_ALIGNMENT;                                                     \
@@ -74,10 +75,11 @@
 #define DECLARE_RUNTIME_ENTRY(name)                                            \
   extern const RuntimeEntry k##name##RuntimeEntry
 
-#define DEFINE_LEAF_RUNTIME_ENTRY(type, name, ...)                             \
+#define DEFINE_LEAF_RUNTIME_ENTRY(type, name, argument_count, ...)             \
   extern "C" type DLRT_##name(__VA_ARGS__);                                    \
   extern const RuntimeEntry k##name##RuntimeEntry(                             \
-      "DLRT_"#name, reinterpret_cast<RuntimeFunction>(&DLRT_##name), 0, true); \
+      "DLRT_"#name, reinterpret_cast<RuntimeFunction>(&DLRT_##name),           \
+      argument_count, true, false);                                            \
   type DLRT_##name(__VA_ARGS__) {                                              \
     CHECK_STACK_ALIGNMENT;                                                     \
     NoGCScope no_gc_scope;                                                     \