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

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

Index: src/compiler/mips/instruction-selector-mips.cc
diff --git a/src/compiler/mips/instruction-selector-mips.cc b/src/compiler/mips/instruction-selector-mips.cc
index c2420ac0d816cc3b7688658cb79c0bb207b3ec9e..f95c82627b080a0bc03c27f0a9d9ccfeff8976f1 100644
--- a/src/compiler/mips/instruction-selector-mips.cc
+++ b/src/compiler/mips/instruction-selector-mips.cc
@@ -533,23 +533,23 @@ void InstructionSelector::VisitCall(Node* node, BasicBlock* handler) {
 
     // Poke any stack arguments.
     int slot = kCArgSlotCount;
-    for (Node* node : buffer.pushed_nodes) {
-      Emit(kMipsStoreToStackSlot, g.NoOutput(), g.UseRegister(node),
+    for (Node* input : buffer.pushed_nodes) {
+      Emit(kMipsStoreToStackSlot, g.NoOutput(), g.UseRegister(input),
            g.TempImmediate(slot << kPointerSizeLog2));
       ++slot;
     }
   } else {
     // Possibly align stack here for functions.
-    int push_count = buffer.pushed_nodes.size();
+    int push_count = static_cast<int>(descriptor->StackParameterCount());
     if (push_count > 0) {
       Emit(kMipsStackClaim, g.NoOutput(),
            g.TempImmediate(push_count << kPointerSizeLog2));
     }
-    int slot = buffer.pushed_nodes.size() - 1;
-    for (Node* node : base::Reversed(buffer.pushed_nodes)) {
-      Emit(kMipsStoreToStackSlot, g.NoOutput(), g.UseRegister(node),
-           g.TempImmediate(slot << kPointerSizeLog2));
-      slot--;
+    for (size_t n = 0; n < buffer.pushed_nodes.size(); ++n) {
+      if (Node* input = buffer.pushed_nodes[n]) {
+        Emit(kMipsStoreToStackSlot, g.NoOutput(), g.UseRegister(input),
+             g.TempImmediate(n << kPointerSizeLog2));
+      }
     }
   }
 
@@ -636,14 +636,14 @@ void InstructionSelector::VisitTailCall(Node* node) {
     // Compute InstructionOperands for inputs and outputs.
     InitializeCallBuffer(node, &buffer, true, false);
     // Possibly align stack here for functions.
-    int push_count = buffer.pushed_nodes.size();
+    int push_count = static_cast<int>(descriptor->StackParameterCount());
     if (push_count > 0) {
       Emit(kMipsStackClaim, g.NoOutput(),
            g.TempImmediate(push_count << kPointerSizeLog2));
     }
-    int slot = buffer.pushed_nodes.size() - 1;
-    for (Node* node : base::Reversed(buffer.pushed_nodes)) {
-      Emit(kMipsStoreToStackSlot, g.NoOutput(), g.UseRegister(node),
+    int slot = static_cast<int>(buffer.pushed_nodes.size()) - 1;
+    for (Node* input : base::Reversed(buffer.pushed_nodes)) {
+      Emit(kMipsStoreToStackSlot, g.NoOutput(), g.UseRegister(input),
            g.TempImmediate(slot << kPointerSizeLog2));
       slot--;
     }