Add MLA instruction to ARM integerated 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 fc5f200a0f6bbf6cad90c41e0f307dc00ba49906..97d02d99018c2175b6c8646f229c21cafb8411b7 100644
--- a/src/DartARM32/assembler_arm.h
+++ b/src/DartARM32/assembler_arm.h
@@ -521,9 +521,11 @@ class Assembler : public ValueObject {
   // Moved to ARM32::AssemblerARM32::mul()
   void mul(Register rd, Register rn, Register rm, Condition cond = AL);
   void muls(Register rd, Register rn, Register rm, Condition cond = AL);
-#endif
+
+  // Moved to ARM32::AssemblerARM32::mla()
   void mla(Register rd, Register rn, Register rm, Register ra,
            Condition cond = AL);
+#endif
   void mls(Register rd, Register rn, Register rm, Register ra,
            Condition cond = AL);
   void smull(Register rd_lo, Register rd_hi, Register rn, Register rm,