Reland "Match fneg for -0.0 - x pattern."

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 d86c354d444796eff1480f98e34aa434f1b2ef67..f3dcdbd4cfad86ec14b4b7c08f21151dfb6d2d94 100644
--- a/src/compiler/arm64/code-generator-arm64.cc
+++ b/src/compiler/arm64/code-generator-arm64.cc
@@ -726,6 +726,9 @@ void CodeGenerator::AssembleArchInstruction(Instruction* instr) {
       __ Fmin(i.OutputDoubleRegister(), i.InputDoubleRegister(0),
               i.InputDoubleRegister(1));
       break;
+    case kArm64Float64Neg:
+      __ Fneg(i.OutputDoubleRegister(), i.InputDoubleRegister(0));
+      break;
     case kArm64Float64Sqrt:
       __ Fsqrt(i.OutputDoubleRegister(), i.InputDoubleRegister(0));
       break;