ARM64: Fixes and more support for FRINT<X> instructions.

src/arm64/assembler-arm64.h

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1566 matching lines @@
 
   // FP negate.
   void fneg(const FPRegister& fd, const FPRegister& fn);
 
   // FP square root.
   void fsqrt(const FPRegister& fd, const FPRegister& fn);
 
   // FP round to integer (nearest with ties to away).
   void frinta(const FPRegister& fd, const FPRegister& fn);
 
+  // FP round to integer (toward minus infinity).
+  void frintm(const FPRegister& fd, const FPRegister& fn);
+
   // FP round to integer (nearest with ties to even).
   void frintn(const FPRegister& fd, const FPRegister& fn);
 
   // FP round to integer (towards zero.)
   void frintz(const FPRegister& fd, const FPRegister& fn);
 
   // FP compare registers.
   void fcmp(const FPRegister& fn, const FPRegister& fm);
 
   // FP compare immediate.
@@ skipping 629 matching lines @@
 class EnsureSpace BASE_EMBEDDED {
  public:
   explicit EnsureSpace(Assembler* assembler) {
     assembler->CheckBuffer();
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_ARM64_ASSEMBLER_ARM64_H_