AArch64: implement easy division and reminder.

This implements easy division and reminder for integer only (32-bit).
The optimisation applies to div/rem by powers of 2 and to div by small
literals (between 3-15).

Change-Id: I71be7c4de5d2e2e738b88984f13efb08f4388a19
diff --git a/compiler/dex/quick/arm64/codegen_arm64.h b/compiler/dex/quick/arm64/codegen_arm64.h
index f1270ec..4985d57 100644
--- a/compiler/dex/quick/arm64/codegen_arm64.h
+++ b/compiler/dex/quick/arm64/codegen_arm64.h
@@ -64,7 +64,9 @@
 
     // Required for target - codegen helpers.
     bool SmallLiteralDivRem(Instruction::Code dalvik_opcode, bool is_div, RegLocation rl_src,
-                            RegLocation rl_dest, int lit);
+                            RegLocation rl_dest, int lit) OVERRIDE;
+    bool HandleEasyDivRem(Instruction::Code dalvik_opcode, bool is_div,
+                          RegLocation rl_src, RegLocation rl_dest, int lit) OVERRIDE;
     bool EasyMultiply(RegLocation rl_src, RegLocation rl_dest, int lit) OVERRIDE;
     LIR* CheckSuspendUsingLoad() OVERRIDE;
     RegStorage LoadHelper(ThreadOffset<4> offset) OVERRIDE;