MIPS: Followup to '[turbofan] Add basic support for calling to (a subset of) C functions.'

src/compiler/mips64/instruction-selector-mips64.cc

Index: src/compiler/mips64/instruction-selector-mips64.cc
diff --git a/src/compiler/mips64/instruction-selector-mips64.cc b/src/compiler/mips64/instruction-selector-mips64.cc
index 48185a676ffb495c5104f86ff9998be100b74046..dc7497f519e2c1f3a88ee60b879d99c3f7fa5f49 100644
--- a/src/compiler/mips64/instruction-selector-mips64.cc
+++ b/src/compiler/mips64/instruction-selector-mips64.cc
@@ -682,11 +682,12 @@ void InstructionSelector::VisitCall(Node* node, BasicBlock* handler) {
          0, nullptr, 0, nullptr);
 
     // Poke any stack arguments.
-    int slot = kCArgSlotCount;
-    for (Node* node : buffer.pushed_nodes) {
-      Emit(kMips64StoreToStackSlot, g.NoOutput(), g.UseRegister(node),
-           g.TempImmediate(slot << kPointerSizeLog2));
-      ++slot;
+    for (size_t n = 0; n < buffer.pushed_nodes.size(); ++n) {
+      if (Node* node = buffer.pushed_nodes[n]) {
+        int const slot = static_cast<int>(n);
+        Emit(kMips64StoreToStackSlot, g.NoOutput(), g.UseRegister(node),
+             g.TempImmediate(slot << kPointerSizeLog2));
+      }
     }
   } else {
     const int32_t push_count = static_cast<int32_t>(buffer.pushed_nodes.size());