emitIAS for push -- simplify push since it's not used for args passing anymore

src/assembler_ia32.cpp

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 //
 // Modified by the Subzero authors.
 //
 //===- subzero/src/assembler_ia32.cpp - Assembler for x86-32  -------------===//
 //
 //                        The Subzero Code Generator
 //
@@ skipping 81 matching lines @@
   EmitInt32(-4);
   assert((buffer_.GetPosition() - call_start) == kCallExternalLabelSize);
   (void)call_start;
 }
 
 void AssemblerX86::pushl(GPRRegister reg) {
   AssemblerBuffer::EnsureCapacity ensured(&buffer_);
   EmitUint8(0x50 + reg);
 }
 
-void AssemblerX86::pushl(const Address &address) {
-  AssemblerBuffer::EnsureCapacity ensured(&buffer_);
-  EmitUint8(0xFF);
-  EmitOperand(6, address);
-}
-
-void AssemblerX86::pushl(const Immediate &imm) {
-  AssemblerBuffer::EnsureCapacity ensured(&buffer_);
-  EmitUint8(0x68);
-  EmitImmediate(BrokenType, imm);
-}
-
 void AssemblerX86::popl(GPRRegister reg) {
   AssemblerBuffer::EnsureCapacity ensured(&buffer_);
   EmitUint8(0x58 + reg);
 }
 
 void AssemblerX86::popl(const Address &address) {
   AssemblerBuffer::EnsureCapacity ensured(&buffer_);
   EmitUint8(0x8F);
   EmitOperand(0, address);
 }
@@ skipping 2153 matching lines @@
   assert(shifter == RegX8632::Encoded_Reg_ecx);
   (void)shifter;
   if (Ty == IceType_i16)
     EmitOperandSizeOverride();
   EmitUint8(isByteSizedArithType(Ty) ? 0xD2 : 0xD3);
   EmitOperand(rm, operand);
 }
 
 } // end of namespace x86
 } // end of namespace Ice