Implemented the RoundInt64ToFloat32 TurboFan operator for x64, arm64, and mips64.

src/compiler/x64/instruction-codes-x64.h

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_COMPILER_X64_INSTRUCTION_CODES_X64_H_
 #define V8_COMPILER_X64_INSTRUCTION_CODES_X64_H_
 
 namespace v8 {
 namespace internal {
 namespace compiler {
@@ skipping 60 matching lines @@
   V(SSEFloat64Abs)                 \
   V(SSEFloat64Neg)                 \
   V(SSEFloat64Sqrt)                \
   V(SSEFloat64Round)               \
   V(SSEFloat64Max)                 \
   V(SSEFloat64Min)                 \
   V(SSEFloat64ToFloat32)           \
   V(SSEFloat64ToInt32)             \
   V(SSEFloat64ToUint32)            \
   V(SSEInt32ToFloat64)             \
+  V(SSEInt64ToFloat32)             \
   V(SSEInt64ToFloat64)             \
   V(SSEUint32ToFloat64)            \
   V(SSEFloat64ExtractLowWord32)    \
   V(SSEFloat64ExtractHighWord32)   \
   V(SSEFloat64InsertLowWord32)     \
   V(SSEFloat64InsertHighWord32)    \
   V(SSEFloat64LoadLowWord32)       \
   V(AVXFloat32Cmp)                 \
   V(AVXFloat32Add)                 \
   V(AVXFloat32Sub)                 \
@@ skipping 67 matching lines @@
   V(M1I)  /* [      %r2*1 + K] */      \
   V(M2I)  /* [      %r2*2 + K] */      \
   V(M4I)  /* [      %r2*4 + K] */      \
   V(M8I)  /* [      %r2*8 + K] */
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_X64_INSTRUCTION_CODES_X64_H_