Unify alloca, outgoing arg, and prolog construction

src/IceInstX8664.cpp

 //===- subzero/src/IceInstX8664.cpp - X86-64 instruction implementation ---===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 ///
 /// \file
@@ skipping 197 matching lines @@
                                   Fixup);
   } else {
     return X8664::Traits::Address(Disp, Fixup);
   }
 }
 
 MachineTraits<TargetX8664>::Address
 MachineTraits<TargetX8664>::VariableSplit::toAsmAddress(const Cfg *Func) const {
   assert(!Var->hasReg());
   const ::Ice::TargetLowering *Target = Func->getTarget();
-  int32_t Offset =
-      Var->getStackOffset() + Target->getStackAdjustment() + getOffset();
+  int32_t Offset = Var->getStackOffset() + getOffset();
   return X8664::Traits::Address(getEncodedGPR(Target->getFrameOrStackReg()),
                                 Offset, AssemblerFixup::NoFixup);
 }
 
 void MachineTraits<TargetX8664>::VariableSplit::emit(const Cfg *Func) const {
   if (!BuildDefs::dump())
     return;
   Ostream &Str = Func->getContext()->getStrEmit();
   assert(!Var->hasReg());
   // The following is copied/adapted from TargetX8664::emitVariable().
   const ::Ice::TargetLowering *Target = Func->getTarget();
   constexpr Type Ty = IceType_i32;
-  int32_t Offset =
-      Var->getStackOffset() + Target->getStackAdjustment() + getOffset();
+  int32_t Offset = Var->getStackOffset() + getOffset();
   if (Offset)
     Str << Offset;
   Str << "(%" << Target->getRegName(Target->getFrameOrStackReg(), Ty) << ")";
 }
 
 void MachineTraits<TargetX8664>::VariableSplit::dump(const Cfg *Func,
                                                      Ostream &Str) const {
   if (!BuildDefs::dump())
     return;
   switch (Part) {
   case Low:
     Str << "low";
     break;
   case High:
     Str << "high";
     break;
   }
   Str << "(";
   if (Func)
     Var->dump(Func);
   else
     Var->dump(Str);
   Str << ")";
 }
 
 } // namespace X86Internal
 } // end of namespace Ice
 
 X86INSTS_DEFINE_STATIC_DATA(TargetX8664)