PPC: Fix "[turbofan] Support unboxed float and double stack parameters."

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

Index: src/compiler/ppc/instruction-selector-ppc.cc
diff --git a/src/compiler/ppc/instruction-selector-ppc.cc b/src/compiler/ppc/instruction-selector-ppc.cc
index 194b95f90ddf03159837f7728851df3cecdc5421..197dcc13ea688e8cef0268bab731a6f395a96b89 100644
--- a/src/compiler/ppc/instruction-selector-ppc.cc
+++ b/src/compiler/ppc/instruction-selector-ppc.cc
@@ -1477,14 +1477,16 @@ void InstructionSelector::VisitCall(Node* node, BasicBlock* handler) {
     int num_slots = static_cast<int>(descriptor->StackParameterCount());
     int slot = 0;
     for (Node* input : buffer.pushed_nodes) {
-      // Skip any alignment holes in pushed nodes.
-      if (input == nullptr) continue;
       if (slot == 0) {
+        DCHECK(input);
         Emit(kPPC_PushFrame, g.NoOutput(), g.UseRegister(input),
              g.TempImmediate(num_slots));
       } else {
-        Emit(kPPC_StoreToStackSlot, g.NoOutput(), g.UseRegister(input),
-             g.TempImmediate(slot));
+        // Skip any alignment holes in pushed nodes.
+        if (input) {
+          Emit(kPPC_StoreToStackSlot, g.NoOutput(), g.UseRegister(input),
+               g.TempImmediate(slot));
+        }
       }
       ++slot;
     }
@@ -1580,9 +1582,17 @@ void InstructionSelector::VisitTailCall(Node* node) {
     InitializeCallBuffer(node, &buffer, true, false);
 
     // Push any stack arguments.
-    for (Node* input : base::Reversed(buffer.pushed_nodes)) {
-      if (input == nullptr) continue;
-      Emit(kPPC_Push, g.NoOutput(), g.UseRegister(input));
+    int num_slots = static_cast<int>(descriptor->StackParameterCount());
+    int slot = 0;
+    for (Node* input : buffer.pushed_nodes) {
+      if (slot == 0) {
+        Emit(kPPC_PushFrame, g.NoOutput(), g.UseRegister(input),
+             g.TempImmediate(num_slots));
+      } else {
+        Emit(kPPC_StoreToStackSlot, g.NoOutput(), g.UseRegister(input),
+             g.TempImmediate(slot));
+      }
+      ++slot;
     }
 
     // Select the appropriate opcode based on the call type.