Revert of [arm] Fix recognition of VNEG.

src/compiler/arm/instruction-selector-arm.cc

Index: src/compiler/arm/instruction-selector-arm.cc
diff --git a/src/compiler/arm/instruction-selector-arm.cc b/src/compiler/arm/instruction-selector-arm.cc
index 7d3243e614bcc4665d9354ac8c38353630477e7e..6e1e0846da4217fa7ef90aa990fa4d2a75aca47a 100644
--- a/src/compiler/arm/instruction-selector-arm.cc
+++ b/src/compiler/arm/instruction-selector-arm.cc
@@ -854,16 +854,16 @@
 
 void InstructionSelector::VisitFloat64Add(Node* node) {
   ArmOperandGenerator g(this);
-  Float64BinopMatcher m(node);
+  Int32BinopMatcher m(node);
   if (m.left().IsFloat64Mul() && CanCover(node, m.left().node())) {
-    Float64BinopMatcher mleft(m.left().node());
+    Int32BinopMatcher mleft(m.left().node());
     Emit(kArmVmlaF64, g.DefineSameAsFirst(node),
          g.UseRegister(m.right().node()), g.UseRegister(mleft.left().node()),
          g.UseRegister(mleft.right().node()));
     return;
   }
   if (m.right().IsFloat64Mul() && CanCover(node, m.right().node())) {
-    Float64BinopMatcher mright(m.right().node());
+    Int32BinopMatcher mright(m.right().node());
     Emit(kArmVmlaF64, g.DefineSameAsFirst(node), g.UseRegister(m.left().node()),
          g.UseRegister(mright.left().node()),
          g.UseRegister(mright.right().node()));
@@ -875,14 +875,9 @@
 
 void InstructionSelector::VisitFloat64Sub(Node* node) {
   ArmOperandGenerator g(this);
-  Float64BinopMatcher m(node);
-  if (m.left().IsMinusZero()) {
-    Emit(kArmVnegF64, g.DefineAsRegister(node),
-         g.UseRegister(m.right().node()));
-    return;
-  }
+  Int32BinopMatcher m(node);
   if (m.right().IsFloat64Mul() && CanCover(node, m.right().node())) {
-    Float64BinopMatcher mright(m.right().node());
+    Int32BinopMatcher mright(m.right().node());
     Emit(kArmVmlsF64, g.DefineSameAsFirst(node), g.UseRegister(m.left().node()),
          g.UseRegister(mright.left().node()),
          g.UseRegister(mright.right().node()));
@@ -893,7 +888,13 @@
 
 
 void InstructionSelector::VisitFloat64Mul(Node* node) {
-  VisitRRRFloat64(this, kArmVmulF64, node);
+  ArmOperandGenerator g(this);
+  Float64BinopMatcher m(node);
+  if (m.right().Is(-1.0)) {
+    Emit(kArmVnegF64, g.DefineAsRegister(node), g.UseRegister(m.left().node()));
+  } else {
+    VisitRRRFloat64(this, kArmVmulF64, node);
+  }
 }