A64: Implement LMathFloorOfDiv and enable the instruction in hydrogen

src/hydrogen-instructions.cc

Index: src/hydrogen-instructions.cc
diff --git a/src/hydrogen-instructions.cc b/src/hydrogen-instructions.cc
index 5c4eb8979371b2fbb62fb5c936cbbbc909042bff..f585bd0da0c161dc603ada1c986d9a984063388c 100644
--- a/src/hydrogen-instructions.cc
+++ b/src/hydrogen-instructions.cc
@@ -1526,7 +1526,7 @@ HValue* HUnaryMathOperation::Canonicalize() {
     if (value()->representation().IsInteger32()) return value();
 
 #if defined(V8_TARGET_ARCH_ARM) || defined(V8_TARGET_ARCH_IA32) || \
-        defined(V8_TARGET_ARCH_X64)
+        defined(V8_TARGET_ARCH_X64) || defined(V8_TARGET_ARCH_A64)
     if (value()->IsDiv() && (value()->UseCount() == 1)) {
       // TODO(2038): Implement this optimization for non ARM architectures.
       HDiv* hdiv = HDiv::cast(value());