[turbofan] Add new Float32Abs and Float64Abs operators.

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

Index: src/compiler/arm64/code-generator-arm64.cc
diff --git a/src/compiler/arm64/code-generator-arm64.cc b/src/compiler/arm64/code-generator-arm64.cc
index 2c0e8f5cdc2785a25cbb7110330da36be6969285..762b57a6bc2a8778bdd4f0a3b368e155e1a92953 100644
--- a/src/compiler/arm64/code-generator-arm64.cc
+++ b/src/compiler/arm64/code-generator-arm64.cc
@@ -688,6 +688,9 @@ void CodeGenerator::AssembleArchInstruction(Instruction* instr) {
       __ Fmin(i.OutputFloat32Register(), i.InputFloat32Register(0),
               i.InputFloat32Register(1));
       break;
+    case kArm64Float32Abs:
+      __ Fabs(i.OutputFloat32Register(), i.InputFloat32Register(0));
+      break;
     case kArm64Float32Sqrt:
       __ Fsqrt(i.OutputFloat32Register(), i.InputFloat32Register(0));
       break;
@@ -736,6 +739,9 @@ void CodeGenerator::AssembleArchInstruction(Instruction* instr) {
       __ Fmin(i.OutputDoubleRegister(), i.InputDoubleRegister(0),
               i.InputDoubleRegister(1));
       break;
+    case kArm64Float64Abs:
+      __ Fabs(i.OutputDoubleRegister(), i.InputDoubleRegister(0));
+      break;
     case kArm64Float64Neg:
       __ Fneg(i.OutputDoubleRegister(), i.InputDoubleRegister(0));
       break;