[turbofan] Unify Math.floor / Math.ceil optimization.

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 0f19cbddfff3c5fe5d51954818d80e6f89d0cef8..349950fee2635df529250867e9416b8f041b5b9a 100644
--- a/src/compiler/arm64/code-generator-arm64.cc
+++ b/src/compiler/arm64/code-generator-arm64.cc
@@ -383,17 +383,17 @@ void CodeGenerator::AssembleArchInstruction(Instruction* instr) {
     case kArchTruncateDoubleToI:
       __ TruncateDoubleToI(i.OutputRegister(), i.InputDoubleRegister(0));
       break;
-    case kArm64Float64Ceil:
-      __ Frintp(i.OutputDoubleRegister(), i.InputDoubleRegister(0));
-      break;
-    case kArm64Float64Floor:
+    case kArm64Float64RoundDown:
       __ Frintm(i.OutputDoubleRegister(), i.InputDoubleRegister(0));
       break;
+    case kArm64Float64RoundTiesAway:
+      __ Frinta(i.OutputDoubleRegister(), i.InputDoubleRegister(0));
+      break;
     case kArm64Float64RoundTruncate:
       __ Frintz(i.OutputDoubleRegister(), i.InputDoubleRegister(0));
       break;
-    case kArm64Float64RoundTiesAway:
-      __ Frinta(i.OutputDoubleRegister(), i.InputDoubleRegister(0));
+    case kArm64Float64RoundUp:
+      __ Frintp(i.OutputDoubleRegister(), i.InputDoubleRegister(0));
       break;
     case kArm64Add:
       __ Add(i.OutputRegister(), i.InputRegister(0), i.InputOperand2_64(1));