[turbofan] Support unboxed float and double stack parameters and add tests.

src/compiler/x64/instruction-selector-x64.cc

Index: src/compiler/x64/instruction-selector-x64.cc
diff --git a/src/compiler/x64/instruction-selector-x64.cc b/src/compiler/x64/instruction-selector-x64.cc
index 6d7fca472e6c504bc9deb8fd006e3a15008bef39..4838f3b69b3e99d4a479ddf79df75a1c4d70503a 100644
--- a/src/compiler/x64/instruction-selector-x64.cc
+++ b/src/compiler/x64/instruction-selector-x64.cc
@@ -1053,21 +1053,22 @@ void InstructionSelector::VisitCall(Node* node, BasicBlock* handler) {
 
     // Poke any stack arguments.
     for (size_t n = 0; n < buffer.pushed_nodes.size(); ++n) {
-      if (Node* node = buffer.pushed_nodes[n]) {
+      if (Node* input = buffer.pushed_nodes[n]) {
         int const slot = static_cast<int>(n);
-        InstructionOperand value =
-            g.CanBeImmediate(node) ? g.UseImmediate(node) : g.UseRegister(node);
+        InstructionOperand value = g.CanBeImmediate(input)
+                                       ? g.UseImmediate(input)
+                                       : g.UseRegister(input);
         Emit(kX64Poke | MiscField::encode(slot), g.NoOutput(), value);
       }
     }
   } else {
     // Push any stack arguments.
-    for (Node* node : base::Reversed(buffer.pushed_nodes)) {
+    for (Node* input : base::Reversed(buffer.pushed_nodes)) {
       // TODO(titzer): handle pushing double parameters.
       InstructionOperand value =
-          g.CanBeImmediate(node)
-              ? g.UseImmediate(node)
-              : IsSupported(ATOM) ? g.UseRegister(node) : g.Use(node);
+          g.CanBeImmediate(input)
+              ? g.UseImmediate(input)
+              : IsSupported(ATOM) ? g.UseRegister(input) : g.Use(input);
       Emit(kX64Push, g.NoOutput(), value);
     }
   }
@@ -1156,12 +1157,12 @@ void InstructionSelector::VisitTailCall(Node* node) {
     InitializeCallBuffer(node, &buffer, true, true);
 
     // Push any stack arguments.
-    for (Node* node : base::Reversed(buffer.pushed_nodes)) {
+    for (Node* input : base::Reversed(buffer.pushed_nodes)) {
       // TODO(titzer): Handle pushing double parameters.
       InstructionOperand value =
-          g.CanBeImmediate(node)
-              ? g.UseImmediate(node)
-              : IsSupported(ATOM) ? g.UseRegister(node) : g.Use(node);
+          g.CanBeImmediate(input)
+              ? g.UseImmediate(input)
+              : IsSupported(ATOM) ? g.UseRegister(input) : g.Use(input);
       Emit(kX64Push, g.NoOutput(), value);
     }