Revert "Revert "Upgrade to 5.0.71.48"" DO NOT MERGE

This reverts commit f2e3994fa5148cc3d9946666f0b0596290192b0e,
and updates the x64 makefile properly so it doesn't break that
build.

FPIIM-449

Change-Id: Ib83e35bfbae6af627451c926a9650ec57c045605
(cherry picked from commit 109988c7ccb6f3fd1a58574fa3dfb88beaef6632)
diff --git a/src/arm64/assembler-arm64.h b/src/arm64/assembler-arm64.h
index 5854704..47786eb 100644
--- a/src/arm64/assembler-arm64.h
+++ b/src/arm64/assembler-arm64.h
@@ -369,6 +369,8 @@
 
 typedef FPRegister DoubleRegister;
 
+// TODO(arm64) Define SIMD registers.
+typedef FPRegister Simd128Register;
 
 // -----------------------------------------------------------------------------
 // Lists of registers.
@@ -925,7 +927,7 @@
 
   // Record a deoptimization reason that can be used by a log or cpu profiler.
   // Use --trace-deopt to enable.
-  void RecordDeoptReason(const int reason, const SourcePosition position);
+  void RecordDeoptReason(const int reason, int raw_position);
 
   int buffer_space() const;