Add UMULL to ARM integrated assembler.

src/DartARM32/assembler_arm.h

Index: src/DartARM32/assembler_arm.h
diff --git a/src/DartARM32/assembler_arm.h b/src/DartARM32/assembler_arm.h
index 2a9aea7ad614d880dc0dde4fe211f01d974344a5..63a1ef8fed3eeb05d0feda480123f3f1522f99bc 100644
--- a/src/DartARM32/assembler_arm.h
+++ b/src/DartARM32/assembler_arm.h
@@ -530,8 +530,11 @@ class Assembler : public ValueObject {
            Condition cond = AL);
   void smull(Register rd_lo, Register rd_hi, Register rn, Register rm,
              Condition cond = AL);
+#if 0
+  // Moved to ARM32::AssemblerARM32::umull();
   void umull(Register rd_lo, Register rd_hi, Register rn, Register rm,
              Condition cond = AL);
+#endif
   void smlal(Register rd_lo, Register rd_hi, Register rn, Register rm,
              Condition cond = AL);
   void umlal(Register rd_lo, Register rd_hi, Register rn, Register rm,