[llvm] [Xtensa] Initial codegen support from IR (PR #78548)

[Sergei Barannikov via llvm-commits]

================
@@ -0,0 +1,27 @@
+//===- XtensaInstrInfo.cpp - Xtensa Instruction Information ---------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This file contains the Xtensa implementation of the TargetInstrInfo class.
+//
+//===----------------------------------------------------------------------===//
+
+#include "XtensaInstrInfo.h"
+#include "XtensaTargetMachine.h"
+#include "llvm/CodeGen/MachineConstantPool.h"
+#include "llvm/CodeGen/MachineInstrBuilder.h"
+#include "llvm/CodeGen/MachineRegisterInfo.h"
+
+#define GET_INSTRINFO_CTOR_DTOR
+#include "XtensaGenInstrInfo.inc"
+
+using namespace llvm;
+
+XtensaInstrInfo::XtensaInstrInfo(XtensaSubtarget &sti)
+    : XtensaGenInstrInfo(), RI(sti), STI(sti) {}
----------------
s-barannikov wrote:

```suggestion
XtensaInstrInfo::XtensaInstrInfo(XtensaSubtarget &STI)
    : XtensaGenInstrInfo(), RI(STI), STI(STI) {}
```

https://github.com/llvm/llvm-project/pull/78548