ARM: Fix JNI MacroAssembler after VIXL update.

This patch fixes an issue found here:
https://android-review.googlesource.com/#/c/307532/

Also re-enables vixl MacroAssembler for arm.

Test: export ART_USE_READ_BARRIER=true; export ART_HEAP_POISONING=true; \
      m test-art-host
Test: export ART_USE_READ_BARRIER=true; export ART_HEAP_POISONING=true; \
      m test-art-target
Test: dump-oat-boot with ART_USE_READ_BARRIER=true

Change-Id: I03e3014fb250791db2d24a0ab1a76ca96384c332
diff --git a/compiler/utils/jni_macro_assembler.cc b/compiler/utils/jni_macro_assembler.cc
index 1b74313..2f154fb 100644
--- a/compiler/utils/jni_macro_assembler.cc
+++ b/compiler/utils/jni_macro_assembler.cc
@@ -20,7 +20,7 @@
 #include <vector>
 
 #ifdef ART_ENABLE_CODEGEN_arm
-#include "arm/jni_macro_assembler_arm.h"
+#include "arm/jni_macro_assembler_arm_vixl.h"
 #endif
 #ifdef ART_ENABLE_CODEGEN_arm64
 #include "arm64/jni_macro_assembler_arm64.h"
@@ -58,7 +58,7 @@
 #ifdef ART_ENABLE_CODEGEN_arm
     case kArm:
     case kThumb2:
-      return MacroAsm32UniquePtr(new (arena) arm::ArmJNIMacroAssembler(arena, instruction_set));
+      return MacroAsm32UniquePtr(new (arena) arm::ArmVIXLJNIMacroAssembler(arena));
 #endif
 #ifdef ART_ENABLE_CODEGEN_mips
     case kMips: