Merge V8 5.3.332.45.  DO NOT MERGE

Test: Manual

FPIIM-449

Change-Id: Id3254828b068abdea3cb10442e0172a8c9a98e03
(cherry picked from commit 13e2dadd00298019ed862f2b2fc5068bba730bcf)
diff --git a/src/mips/assembler-mips.h b/src/mips/assembler-mips.h
index c595cc9..8f4f9d9 100644
--- a/src/mips/assembler-mips.h
+++ b/src/mips/assembler-mips.h
@@ -125,8 +125,6 @@
     Register r = {code};
     return r;
   }
-  const char* ToString();
-  bool IsAllocatable() const;
   bool is_valid() const { return 0 <= reg_code && reg_code < kNumRegisters; }
   bool is(Register reg) const { return reg_code == reg.reg_code; }
   int code() const {
@@ -155,6 +153,8 @@
 
 Register ToRegister(int num);
 
+static const bool kSimpleFPAliasing = true;
+
 // Coprocessor register.
 struct FPURegister {
   enum Code {
@@ -173,8 +173,6 @@
   // to number of 32-bit FPU regs, but kNumAllocatableRegisters refers to
   // number of Double regs (64-bit regs, or FPU-reg-pairs).
 
-  const char* ToString();
-  bool IsAllocatable() const;
   bool is_valid() const { return 0 <= reg_code && reg_code < kMaxNumRegisters; }
   bool is(FPURegister reg) const { return reg_code == reg.reg_code; }
   FPURegister low() const {
@@ -850,6 +848,10 @@
   void bitswap(Register rd, Register rt);
   void align(Register rd, Register rs, Register rt, uint8_t bp);
 
+  void wsbh(Register rd, Register rt);
+  void seh(Register rd, Register rt);
+  void seb(Register rd, Register rt);
+
   // --------Coprocessor-instructions----------------
 
   // Load, store, and move.