[builtins]: Uniformly push argument count in TF-generated builtins

src/compiler/linkage.h

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_COMPILER_LINKAGE_H_
 #define V8_COMPILER_LINKAGE_H_
 
 #include "src/base/compiler-specific.h"
 #include "src/base/flags.h"
 #include "src/compiler/frame.h"
@@ skipping 169 matching lines @@
     kSupportsTailCalls = 1u << 2,
     kCanUseRoots = 1u << 3,
     // (arm64 only) native stack should be used for arguments.
     kUseNativeStack = 1u << 4,
     // (arm64 only) call instruction has to restore JSSP or CSP.
     kRestoreJSSP = 1u << 5,
     kRestoreCSP = 1u << 6,
     // Causes the code generator to initialize the root register.
     kInitializeRootRegister = 1u << 7,
     // Does not ever try to allocate space on our heap.
-    kNoAllocate = 1u << 8
+    kNoAllocate = 1u << 8,
+    // Push argument count as part of function prologue.
+    kPushArgumentCount = 1u << 9
   };
   typedef base::Flags<Flag> Flags;
 
   CallDescriptor(Kind kind, MachineType target_type, LinkageLocation target_loc,
                  LocationSignature* location_sig, size_t stack_param_count,
                  Operator::Properties properties,
                  RegList callee_saved_registers,
                  RegList callee_saved_fp_registers, Flags flags,
                  const char* debug_name = "")
       : kind_(kind),
@@ skipping 41 matching lines @@
   // TODO(titzer): this should input the framestate input too.
   size_t InputCount() const { return 1 + location_sig_->parameter_count(); }
 
   size_t FrameStateCount() const { return NeedsFrameState() ? 1 : 0; }
 
   Flags flags() const { return flags_; }
 
   bool NeedsFrameState() const { return flags() & kNeedsFrameState; }
   bool SupportsTailCalls() const { return flags() & kSupportsTailCalls; }
   bool UseNativeStack() const { return flags() & kUseNativeStack; }
+  bool PushArgumentCount() const { return flags() & kPushArgumentCount; }
   bool InitializeRootRegister() const {
     return flags() & kInitializeRootRegister;
   }
 
   LinkageLocation GetReturnLocation(size_t index) const {
     return location_sig_->GetReturn(index);
   }
 
   LinkageLocation GetInputLocation(size_t index) const {
     if (index == 0) return target_loc_;
@@ skipping 27 matching lines @@
   const char* debug_name() const { return debug_name_; }
 
   bool UsesOnlyRegisters() const;
 
   bool HasSameReturnLocationsAs(const CallDescriptor* other) const;
 
   int GetStackParameterDelta(const CallDescriptor* tail_caller = nullptr) const;
 
   bool CanTailCall(const Node* call) const;
 
+  int CalculateFixedFrameSize() const;
+
  private:
   friend class Linkage;
 
   const Kind kind_;
   const MachineType target_type_;
   const LinkageLocation target_loc_;
   const LocationSignature* const location_sig_;
   const size_t stack_param_count_;
   const Operator::Properties properties_;
   const RegList callee_saved_registers_;
@@ skipping 127 matching lines @@
   CallDescriptor* const incoming_;
 
   DISALLOW_COPY_AND_ASSIGN(Linkage);
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_LINKAGE_H_