[turbofan] Add new Float32Abs and Float64Abs operators.

src/compiler/node-matchers.h

Index: src/compiler/node-matchers.h
diff --git a/src/compiler/node-matchers.h b/src/compiler/node-matchers.h
index 627829f4b56976a99e35a9ed23767995e1e821e9..cfe4c14d9741c1b126a237d9d023f6900d8148c9 100644
--- a/src/compiler/node-matchers.h
+++ b/src/compiler/node-matchers.h
@@ -30,6 +30,8 @@ struct NodeMatcher {
   }
   Node* InputAt(int index) const { return node()->InputAt(index); }
 
+  bool Equals(const Node* node) const { return node_ == node; }
+
   bool IsComparison() const;
 
 #define DEFINE_IS_OPCODE(Opcode) \
@@ -141,6 +143,7 @@ struct FloatMatcher FINAL : public ValueMatcher<T, kOpcode> {
     return this->Is(0.0) && std::signbit(this->Value());
   }
   bool IsNaN() const { return this->HasValue() && std::isnan(this->Value()); }
+  bool IsZero() const { return this->Is(0.0) && !std::signbit(this->Value()); }
 };
 
 typedef FloatMatcher<float, IrOpcode::kFloat32Constant> Float32Matcher;