[turbofan] Add backend support for load/store float32 values.

src/compiler/arm64/code-generator-arm64.cc

 // 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.
 
 #include "src/compiler/code-generator.h"
 
 #include "src/arm64/macro-assembler-arm64.h"
 #include "src/compiler/code-generator-impl.h"
 #include "src/compiler/gap-resolver.h"
 #include "src/compiler/node-matchers.h"
@@ skipping 408 matching lines @@
       break;
     case kArm64StrW:
       __ Str(i.InputRegister32(2), i.MemoryOperand());
       break;
     case kArm64Ldr:
       __ Ldr(i.OutputRegister(), i.MemoryOperand());
       break;
     case kArm64Str:
       __ Str(i.InputRegister(2), i.MemoryOperand());
       break;
+    case kArm64LdrS: {
+      UseScratchRegisterScope scope(masm());
+      FPRegister scratch = scope.AcquireS();
+      __ Ldr(scratch, i.MemoryOperand());
+      __ Fcvt(i.OutputDoubleRegister(), scratch);
+      break;
+    }
+    case kArm64StrS: {
+      UseScratchRegisterScope scope(masm());
+      FPRegister scratch = scope.AcquireS();
+      __ Fcvt(scratch, i.InputDoubleRegister(2));
+      __ Str(scratch, i.MemoryOperand());
+      break;
+    }
     case kArm64LdrD:
       __ Ldr(i.OutputDoubleRegister(), i.MemoryOperand());
       break;
     case kArm64StrD:
       __ Str(i.InputDoubleRegister(2), i.MemoryOperand());
       break;
     case kArm64StoreWriteBarrier: {
       Register object = i.InputRegister(0);
       Register index = i.InputRegister(1);
       Register value = i.InputRegister(2);
@@ skipping 394 matching lines @@
 }
 
 
 void CodeGenerator::AddNopForSmiCodeInlining() { __ movz(xzr, 0); }
 
 #undef __
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8