Implements OSR for arm and mips.

runtime/vm/stub_code_arm.cc

Index: runtime/vm/stub_code_arm.cc
===================================================================
--- runtime/vm/stub_code_arm.cc	(revision 24893)
+++ runtime/vm/stub_code_arm.cc	(working copy)
@@ -1334,18 +1334,8 @@
     __ LeaveStubFrame();
   }
   __ ldr(R7, FieldAddress(func_reg, Function::usage_counter_offset()));
-  Label is_hot;
-  if (FlowGraphCompiler::CanOptimize()) {
-    ASSERT(FLAG_optimization_counter_threshold > 1);
-    __ CompareImmediate(R7, FLAG_optimization_counter_threshold);
-    __ b(&is_hot, GE);
-    // As long as VM has no OSR do not optimize in the middle of the function
-    // but only at exit so that we have collected all type feedback before
-    // optimizing.
-  }
   __ add(R7, R7, ShifterOperand(1));
   __ str(R7, FieldAddress(func_reg, Function::usage_counter_offset()));
-  __ Bind(&is_hot);
 }
 
 
@@ -1357,20 +1347,8 @@
   ASSERT(temp_reg == R6);
   __ ldr(func_reg, FieldAddress(ic_reg, ICData::function_offset()));
   __ ldr(R7, FieldAddress(func_reg, Function::usage_counter_offset()));
-  Label is_hot;
-  if (FlowGraphCompiler::CanOptimize()) {
-    ASSERT(FLAG_optimization_counter_threshold > 1);
-    // The usage_counter is always less than FLAG_optimization_counter_threshold
-    // except when the function gets optimized.
-    __ CompareImmediate(R7, FLAG_optimization_counter_threshold);
-    __ b(&is_hot, EQ);
-    // As long as VM has no OSR do not optimize in the middle of the function
-    // but only at exit so that we have collected all type feedback before
-    // optimizing.
-  }
   __ add(R7, R7, ShifterOperand(1));
   __ str(R7, FieldAddress(func_reg, Function::usage_counter_offset()));
-  __ Bind(&is_hot);
 }