Adds support for integer division for ARM chips without the sdiv instruction.

runtime/vm/assembler_arm.h

Index: runtime/vm/assembler_arm.h
===================================================================
--- runtime/vm/assembler_arm.h	(revision 24627)
+++ runtime/vm/assembler_arm.h	(working copy)
@@ -549,6 +549,12 @@
   // Compare rn with signed immediate value. May clobber IP.
   void CompareImmediate(Register rn, int32_t value, Condition cond = AL);
 
+  // Signed integer division of left by right. Checks to see if integer
+  // division is supported. If not, uses the FPU for division with
+  // temporary registers tmpl and tmpr. tmpl may not be DTMP, but tmpr may.
+  void IntegerDivide(Register result, Register left, Register right,

[regis, 2013/07/01 16:54:09]

You could remove the restriction ("tmpl may not be DTMP, but tmpr may") by using
the S registers overlapped by tmpl and tmpr.

[zra, 2013/07/01 17:43:46]

Done.

+                     DRegister tmpl, DRegister tmpr);
+
   // Load and Store. May clobber IP.
   void LoadImmediate(Register rd, int32_t value, Condition cond = AL);
   void LoadSImmediate(SRegister sd, float value, Condition cond = AL);