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/mips64/codegen-mips64.cc b/src/mips64/codegen-mips64.cc
index 022426e..c8cde97 100644
--- a/src/mips64/codegen-mips64.cc
+++ b/src/mips64/codegen-mips64.cc
@@ -1078,8 +1078,7 @@
   __ And(at, result, Operand(kStringEncodingMask));
   __ Branch(&one_byte, ne, at, Operand(zero_reg));
   // Two-byte string.
-  __ dsll(at, index, 1);
-  __ Daddu(at, string, at);
+  __ Dlsa(at, string, index, 1);
   __ lhu(result, MemOperand(at));
   __ jmp(&done);
   __ bind(&one_byte);
@@ -1151,8 +1150,7 @@
 
   // Must not call ExpConstant() after overwriting temp3!
   __ li(temp3, Operand(ExternalReference::math_exp_log_table()));
-  __ dsll(at, temp2, 3);
-  __ Daddu(temp3, temp3, Operand(at));
+  __ Dlsa(temp3, temp3, temp2, 3);
   __ lwu(temp2, MemOperand(temp3, Register::kMantissaOffset));
   __ lwu(temp3, MemOperand(temp3, Register::kExponentOffset));
   // The first word is loaded is the lower number register.