[optimizing compiler] Add REM_INT, REM_LONG

- for arm, x86, x86_64
- minor cleanup/fix in div tests

Change-Id: I240874010206a5a9b3aaffbc81a885b94c248f93
diff --git a/compiler/optimizing/code_generator_arm64.cc b/compiler/optimizing/code_generator_arm64.cc
index 887a4ef..5432882 100644
--- a/compiler/optimizing/code_generator_arm64.cc
+++ b/compiler/optimizing/code_generator_arm64.cc
@@ -643,11 +643,12 @@
   M(MonitorOperation)                                      \
   M(Or)                                                    \
   M(ParallelMove)                                          \
+  M(Rem)                                                   \
   M(StaticFieldGet)                                        \
   M(StaticFieldSet)                                        \
   M(Throw)                                                 \
   M(TypeConversion)                                        \
-  M(Xor)                                                    \
+  M(Xor)                                                   \
 
 #define UNIMPLEMENTED_INSTRUCTION_BREAK_CODE(name) name##UnimplementedInstructionBreakCode