[wasm] Fixed F32Neg and F64Neg for -0.0.

src/compiler/wasm-compiler.cc

Index: src/compiler/wasm-compiler.cc
diff --git a/src/compiler/wasm-compiler.cc b/src/compiler/wasm-compiler.cc
index d2f2eda136a7b72daae0df5ac18625df26a65bec..3022237fabe194fae88f426cd0f5b9ea0a2a5bf9 100644
--- a/src/compiler/wasm-compiler.cc
+++ b/src/compiler/wasm-compiler.cc
@@ -669,8 +669,8 @@ Node* WasmGraphBuilder::Unop(wasm::WasmOpcode opcode, Node* input) {
       op = m->Float32Abs();
       break;
     case wasm::kExprF32Neg:
-      op = m->Float32Sub();
-      return graph()->NewNode(op, jsgraph()->Float32Constant(0), input);
+      op = m->Float32Mul();
+      return graph()->NewNode(op, jsgraph()->Float32Constant(-1), input);
     case wasm::kExprF32Sqrt:
       op = m->Float32Sqrt();
       break;
@@ -678,8 +678,8 @@ Node* WasmGraphBuilder::Unop(wasm::WasmOpcode opcode, Node* input) {
       op = m->Float64Abs();
       break;
     case wasm::kExprF64Neg:
-      op = m->Float64Sub();
-      return graph()->NewNode(op, jsgraph()->Float64Constant(0), input);
+      op = m->Float64Mul();
+      return graph()->NewNode(op, jsgraph()->Float64Constant(-1), input);
     case wasm::kExprF64Sqrt:
       op = m->Float64Sqrt();
       break;