X87: [turbofan] Better and more sane support for tail calls

    port ff283f7d (r31987)

    original commit message:
    * Limit triggering of tail calls to explicit use of a new inline runtime
      function %_TailCall. %_TailCall works just like %_Call except for using
      tail-calling mechanics (currently only in TF).
    * Remove hack that recognized some specific usages of %_Call and converted them
      into tail calls.
    * Support tail calls for all calls where the number of callee stack parameters
      is less than or equal to the number of caller stack parameters.
    * Use the gap resolver to swizzle parameters and registers to tail calls.

BUG=

Review URL: https://codereview.chromium.org/1445023002

Cr-Commit-Position: refs/heads/master@{#32001}

src/compiler/x87/code-generator-x87.cc

@@ -330,13 +330,20 @@ class OutOfLineRecordWrite final : public OutOfLineCode {
   } while (false)
 
 
-void CodeGenerator::AssembleDeconstructActivationRecord() {
+void CodeGenerator::AssembleDeconstructActivationRecord(int stack_param_delta) {
   CallDescriptor* descriptor = linkage()->GetIncomingDescriptor();
   int stack_slots = frame()->GetSpillSlotCount();
   if (descriptor->IsJSFunctionCall() || stack_slots > 0) {
     __ mov(esp, ebp);
     __ pop(ebp);
   }
+  if (stack_param_delta < 0) {
+    int offset = -(stack_param_delta + 1) * kPointerSize;
+    __ pop(Operand(esp, offset));
+    if (offset != 0) {
+      __ add(esp, Immediate(offset));
+    }
+  }
 }
 
 
@@ -372,7 +379,8 @@ void CodeGenerator::AssembleArchInstruction(Instruction* instr) {
       break;
     }
     case kArchTailCallCodeObject: {
-      AssembleDeconstructActivationRecord();
+      int stack_param_delta = i.InputInt32(instr->InputCount() - 1);
+      AssembleDeconstructActivationRecord(stack_param_delta);
       if (HasImmediateInput(instr, 0)) {
         Handle<Code> code = Handle<Code>::cast(i.InputHeapObject(0));
         __ jmp(code, RelocInfo::CODE_TARGET);
@@ -415,7 +423,8 @@ void CodeGenerator::AssembleArchInstruction(Instruction* instr) {
         __ cmp(esi, FieldOperand(func, JSFunction::kContextOffset));
         __ Assert(equal, kWrongFunctionContext);
       }
-      AssembleDeconstructActivationRecord();
+      int stack_param_delta = i.InputInt32(instr->InputCount() - 1);
+      AssembleDeconstructActivationRecord(stack_param_delta);
       __ jmp(FieldOperand(func, JSFunction::kCodeEntryOffset));
       break;
     }