ARM: Implement DoDivI in the lithium code generator.

src/arm/macro-assembler-arm.h

Index: src/arm/macro-assembler-arm.h
diff --git a/src/arm/macro-assembler-arm.h b/src/arm/macro-assembler-arm.h
index e997136527985941e3da9aeb5de426f60c2d9e62..324fbb2dde9cdac4675ce28b473a8d1f2a9b0f74 100644
--- a/src/arm/macro-assembler-arm.h
+++ b/src/arm/macro-assembler-arm.h
@@ -232,6 +232,9 @@ class MacroAssembler: public Assembler {
   // RegList constant kSafepointSavedRegisters.
   void PushSafepointRegisters();
   void PopSafepointRegisters();
+  void PushSafepointRegistersAndDoubles();
+  void PopSafepointRegistersAndDoubles();
+
   static int SafepointRegisterStackIndex(int reg_code);
 
   // Load two consecutive registers with two consecutive memory locations.
@@ -716,6 +719,16 @@ class MacroAssembler: public Assembler {
     add(reg, reg, Operand(reg), s);
   }
 
+  // Try to convert int32 to smi. If the value is to large, preserve
+  // the original value and jump to not_a_smi. Destroys scratch and
+  // sets flags.
+  void TrySmiTag(Register reg, Label* not_a_smi, Register scratch) {
+    mov(scratch, reg);
+    SmiTag(scratch, SetCC);
+    b(vs, not_a_smi);
+    mov(reg, scratch);
+  }
+
   void SmiUntag(Register reg) {
     mov(reg, Operand(reg, ASR, kSmiTagSize));
   }