[turbofan] Add backend support for float32.

src/arm/assembler-arm-inl.h

 // Copyright (c) 1994-2006 Sun Microsystems Inc.
 // 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.
 //
@@ skipping 52 matching lines @@
 int DwVfpRegister::NumReservedRegisters() {
   return kNumReservedRegisters;
 }
 
 
 int DwVfpRegister::NumAllocatableRegisters() {
   return NumRegisters() - kNumReservedRegisters;
 }
 
 
+// static
+int DwVfpRegister::NumAllocatableAliasedRegisters() {
+  return LowDwVfpRegister::kMaxNumLowRegisters - kNumReservedRegisters;
+}
+
+
 int DwVfpRegister::ToAllocationIndex(DwVfpRegister reg) {
   DCHECK(!reg.is(kDoubleRegZero));
   DCHECK(!reg.is(kScratchDoubleReg));
   if (reg.code() > kDoubleRegZero.code()) {
     return reg.code() - kNumReservedRegisters;
   }
   return reg.code();
 }
 
 
@@ skipping 580 matching lines @@
     if (icache_flush_mode != SKIP_ICACHE_FLUSH) {
       CpuFeatures::FlushICache(pc, 4 * kInstrSize);
     }
   }
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_ARM_ASSEMBLER_ARM_INL_H_