Enable code optimization on ARM.

runtime/vm/code_generator.cc

Index: runtime/vm/code_generator.cc
===================================================================
--- runtime/vm/code_generator.cc	(revision 23031)
+++ runtime/vm/code_generator.cc	(working copy)
@@ -38,11 +38,13 @@
     "Trace IC miss in optimized code");
 DEFINE_FLAG(bool, trace_patching, false, "Trace patching of code.");
 DEFINE_FLAG(bool, trace_runtime_calls, false, "Trace runtime calls");
-#if defined(TARGET_ARCH_IA32) || defined(TARGET_ARCH_X64)
+#if defined(TARGET_ARCH_IA32) ||                                               \
+    defined(TARGET_ARCH_X64) ||                                                \
+    defined(TARGET_ARCH_ARM)
 DEFINE_FLAG(int, optimization_counter_threshold, 3000,
     "Function's usage-counter value before it is optimized, -1 means never");
 #else
-// TODO(regis): Enable optimization on ARM and MIPS.
+// TODO(regis): Enable optimization on MIPS.
 DEFINE_FLAG(int, optimization_counter_threshold, -1,
     "Function's usage-counter value before it is optimized, -1 means never");
 #endif
@@ -1469,6 +1471,7 @@
 
 // Copy saved registers into the isolate buffer.
 static void CopySavedRegisters(uword saved_registers_address) {
+  ASSERT(sizeof(fpu_register_t) == kFpuRegisterSize);
   fpu_register_t* fpu_registers_copy =
       new fpu_register_t[kNumberOfFpuRegisters];
   ASSERT(fpu_registers_copy != NULL);
@@ -1479,6 +1482,7 @@
   }
   Isolate::Current()->set_deopt_fpu_registers_copy(fpu_registers_copy);
 
+  ASSERT(sizeof(intptr_t) == kWordSize);
   intptr_t* cpu_registers_copy = new intptr_t[kNumberOfCpuRegisters];
   ASSERT(cpu_registers_copy != NULL);
   for (intptr_t i = 0; i < kNumberOfCpuRegisters; i++) {
@@ -1727,6 +1731,7 @@
     String& line_string = String::Handle(script.GetLine(line));
     OS::PrintErr("  Function: %s\n", top_function.ToFullyQualifiedCString());
     OS::PrintErr("  Line %"Pd": '%s'\n", line, line_string.ToCString());
+    OS::PrintErr("  Deopt args: %"Pd"\n", deopt_arguments);
   }
 }