Introduce the ability to insert IACA (Intel Architecture Code Analyzer) marks to

src/IceAssemblerX86BaseImpl.h

Index: src/IceAssemblerX86BaseImpl.h
diff --git a/src/IceAssemblerX86BaseImpl.h b/src/IceAssemblerX86BaseImpl.h
index 5b853fdb2cc7cfa9c9fb358541df3ee080e9e0ac..191876c1b5f992b12343c699daeb5b683ad15f2f 100644
--- a/src/IceAssemblerX86BaseImpl.h
+++ b/src/IceAssemblerX86BaseImpl.h
@@ -3106,6 +3106,43 @@ void AssemblerX86Base<Machine>::xchg(Type Ty,
   emitOperand(gprEncoding(reg), addr);
 }
 
+template <class Machine> void AssemblerX86Base<Machine>::iaca_start() {
+  AssemblerBuffer::EnsureCapacity ensured(&Buffer);
+  emitUint8(0x0F);
+  emitUint8(0x0B);
+
+  // mov $111, ebx
+  constexpr typename Traits::GPRRegister dst =
+      Traits::GPRRegister::Encoded_Reg_ebx;
+  constexpr Type Ty = IceType_i32;
+  emitRexB(Ty, dst);
+  emitUint8(0xB8 + gprEncoding(dst));
+  emitImmediate(Ty, Immediate(111));
+
+  emitUint8(0x64);
+  emitUint8(0x67);
+  emitUint8(0x90);
+}
+
+template <class Machine> void AssemblerX86Base<Machine>::iaca_end() {
+  AssemblerBuffer::EnsureCapacity ensured(&Buffer);
+
+  // mov $222, ebx
+  constexpr typename Traits::GPRRegister dst =
+      Traits::GPRRegister::Encoded_Reg_ebx;
+  constexpr Type Ty = IceType_i32;
+  emitRexB(Ty, dst);
+  emitUint8(0xB8 + gprEncoding(dst));
+  emitImmediate(Ty, Immediate(222));
+
+  emitUint8(0x64);
+  emitUint8(0x67);
+  emitUint8(0x90);
+
+  emitUint8(0x0F);
+  emitUint8(0x0B);
+}
+
 template <class Machine>
 void AssemblerX86Base<Machine>::emitSegmentOverride(uint8_t prefix) {
   AssemblerBuffer::EnsureCapacity ensured(&Buffer);