Get llvm performance back.

Change-Id: I2ee32bc26e9cd33a541fc85154634b1d77d5bc16
diff --git a/src/compiler_llvm/backend_options.h b/src/compiler_llvm/backend_options.h
index bccf8a3..f8295d1 100644
--- a/src/compiler_llvm/backend_options.h
+++ b/src/compiler_llvm/backend_options.h
@@ -24,7 +24,7 @@
 extern llvm::cl::opt<bool> ReserveR9;
 
 #define INITIAL_ARM_BACKEND_OPTIONS \
-EnableARMLongCalls = true; \
+EnableARMLongCalls = false; \
 ReserveR9 = true;
 
 #define DECLARE_X86_BACKEND_OPTIONS