[turbofan] Add backend support for float32.

src/arm64/assembler-arm64.h

 // Copyright 2013 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_ARM64_ASSEMBLER_ARM64_H_
 #define V8_ARM64_ASSEMBLER_ARM64_H_
 
 #include <list>
 #include <map>
 #include <vector>
@@ skipping 258 matching lines @@
 
   // Gap between low and high ranges.
   static const int kAllocatableRangeGapSize =
       (kAllocatableHighRangeBegin - kAllocatableLowRangeEnd) - 1;
 
   static const int kMaxNumAllocatableRegisters =
       (kAllocatableLowRangeEnd - kAllocatableLowRangeBegin + 1) +
       (kAllocatableHighRangeEnd - kAllocatableHighRangeBegin + 1);
   static int NumAllocatableRegisters() { return kMaxNumAllocatableRegisters; }
 
+  // TODO(turbofan): Proper float32 support.
+  static int NumAllocatableAliasedRegisters() {
+    return NumAllocatableRegisters();
+  }
+
   // Return true if the register is one that crankshaft can allocate.
   bool IsAllocatable() const {
     return (Bit() & kAllocatableFPRegisters) != 0;
   }
 
   static FPRegister FromAllocationIndex(unsigned int index) {
     DCHECK(index < static_cast<unsigned>(NumAllocatableRegisters()));
 
     return (index <= kAllocatableLowRangeEnd)
         ? from_code(index)
@@ skipping 2002 matching lines @@
 class EnsureSpace BASE_EMBEDDED {
  public:
   explicit EnsureSpace(Assembler* assembler) {
     assembler->CheckBufferSpace();
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_ARM64_ASSEMBLER_ARM64_H_