[turbofan]: Support using push instructions for setting up tail call parameters

src/compiler/code-generator.h

Index: src/compiler/code-generator.h
diff --git a/src/compiler/code-generator.h b/src/compiler/code-generator.h
index 5f35e8a36ec5da8f9e5a81b0c3e49ed30461630a..ebfbb2db51816a0dd036a28ea83c7624bcd1aa5a 100644
--- a/src/compiler/code-generator.h
+++ b/src/compiler/code-generator.h
@@ -101,6 +101,11 @@ class CodeGenerator final : public GapResolver::Assembler {
   void AssembleSourcePosition(Instruction* instr);
   void AssembleGaps(Instruction* instr);
 
+  // Returns true if a instruction needs to adjust the stack pointer before
+  // execution. The stack slot index to the empty slot above the adjusted stack
+  // pointer is returned in |slot|.
+  bool GetSlotAboveSPAfterGap(Instruction* instr, int* slot);
+
   // ===========================================================================
   // ============= Architecture-specific code generation methods. ==============
   // ===========================================================================
@@ -123,18 +128,18 @@ class CodeGenerator final : public GapResolver::Assembler {
   // to tear down a stack frame.
   void AssembleReturn();
 
-  // Generates code to deconstruct a the caller's frame, including arguments.
-  void AssembleDeconstructActivationRecord(int stack_param_delta);
-
   void AssembleDeconstructFrame();
 
   // Generates code to manipulate the stack in preparation for a tail call.
-  void AssemblePrepareTailCall(int stack_param_delta);
+  void AssemblePrepareTailCall();
 
   // Generates code to pop current frame if it is an arguments adaptor frame.
   void AssemblePopArgumentsAdaptorFrame(Register args_reg, Register scratch1,
                                         Register scratch2, Register scratch3);
 
+  void AssemblePreGaps(Instruction* instr);
+  void AssemblePostGaps(Instruction* instr);
+
   // ===========================================================================
   // ============== Architecture-specific gap resolver methods. ================
   // ===========================================================================
@@ -187,12 +192,6 @@ class CodeGenerator final : public GapResolver::Assembler {
   DeoptimizationExit* AddDeoptimizationExit(Instruction* instr,
                                             size_t frame_state_offset);
 
-  // Converts the delta in the number of stack parameter passed from a tail
-  // caller to the callee into the distance (in pointers) the SP must be
-  // adjusted, taking frame elision and other relevant factors into
-  // consideration.
-  int TailCallFrameStackSlotDelta(int stack_param_delta);
-
   // ===========================================================================
 
   struct DeoptimizationState : ZoneObject {