[HLSL] Add llvm intrinsic for HLSL.

[python3kgae]

Summary

A directx specific llvm intrinsic is introduced:

float @llvm.dx.sin.f32(float)

It is for https://github.com/Microsoft/DirectXShaderCompiler/blob/master/docs/DXIL.rst#sin.
This change the llvm intrinsic and test it can be generated from clang codeGen.
The clang builtin change is in https://reviews.llvm.org/D124593

[python3kgae]

Remove clang part change.

[python3kgae]

Change to different implementation.

clang/test/CodeGenHLSL/Builtins/sin_f32.hlsl

+// RUN: %clang_cc1 -triple dxil-pc-shadermodel6.15-library -x hlsl -S -emit-llvm  -o - %s | FileCheck %s
+
+//CHECK:call float @llvm.dx.sin.f32
+
+float foo(float a) {
+  return __builtin_dx_sin_f32(a);
+}

llvm/include/llvm/IR/CMakeLists.txt

 set(LLVM_TARGET_DEFINITIONS Attributes.td)
 tablegen(LLVM Attributes.inc -gen-attrs)
 
 set(LLVM_TARGET_DEFINITIONS Intrinsics.td)
 tablegen(LLVM IntrinsicImpl.inc -gen-intrinsic-impl)
 tablegen(LLVM IntrinsicEnums.inc -gen-intrinsic-enums)
 tablegen(LLVM IntrinsicsAArch64.h -gen-intrinsic-enums -intrinsic-prefix=aarch64)
 tablegen(LLVM IntrinsicsAMDGPU.h -gen-intrinsic-enums -intrinsic-prefix=amdgcn)
 tablegen(LLVM IntrinsicsARM.h -gen-intrinsic-enums -intrinsic-prefix=arm)
 tablegen(LLVM IntrinsicsBPF.h -gen-intrinsic-enums -intrinsic-prefix=bpf)
+tablegen(LLVM IntrinsicsDirectX.h -gen-intrinsic-enums -intrinsic-prefix=dx)
 tablegen(LLVM IntrinsicsHexagon.h -gen-intrinsic-enums -intrinsic-prefix=hexagon)
 tablegen(LLVM IntrinsicsMips.h -gen-intrinsic-enums -intrinsic-prefix=mips)
 tablegen(LLVM IntrinsicsNVPTX.h -gen-intrinsic-enums -intrinsic-prefix=nvvm)
 tablegen(LLVM IntrinsicsPowerPC.h -gen-intrinsic-enums -intrinsic-prefix=ppc)
 tablegen(LLVM IntrinsicsR600.h -gen-intrinsic-enums -intrinsic-prefix=r600)
 tablegen(LLVM IntrinsicsRISCV.h -gen-intrinsic-enums -intrinsic-prefix=riscv)
 tablegen(LLVM IntrinsicsS390.h -gen-intrinsic-enums -intrinsic-prefix=s390)
 tablegen(LLVM IntrinsicsWebAssembly.h -gen-intrinsic-enums -intrinsic-prefix=wasm)
 tablegen(LLVM IntrinsicsX86.h -gen-intrinsic-enums -intrinsic-prefix=x86)
 tablegen(LLVM IntrinsicsXCore.h -gen-intrinsic-enums -intrinsic-prefix=xcore)
 tablegen(LLVM IntrinsicsVE.h -gen-intrinsic-enums -intrinsic-prefix=ve)
 add_public_tablegen_target(intrinsics_gen)

llvm/include/llvm/IR/Intrinsics.td

 include "llvm/IR/IntrinsicsNVVM.td"
 include "llvm/IR/IntrinsicsMips.td"
 include "llvm/IR/IntrinsicsAMDGPU.td"
 include "llvm/IR/IntrinsicsBPF.td"
 include "llvm/IR/IntrinsicsSystemZ.td"
 include "llvm/IR/IntrinsicsWebAssembly.td"
 include "llvm/IR/IntrinsicsRISCV.td"
 include "llvm/IR/IntrinsicsVE.td"
+include "llvm/IR/IntrinsicsDirectX.td"

llvm/include/llvm/IR/IntrinsicsDirectX.td

+//===- IntrinsicsDirectX.td - Defines DirectX intrinsics ---*- tablegen -*-===//
+//
+// 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 defines all of the DirectX-specific intrinsics.
+//
+//===----------------------------------------------------------------------===//
+
+// Specialized loads from packet
+let TargetPrefix = "dx" in {  // All intrinsics start with "llvm.dx."
+  def int_dx_sin_f32 : GCCBuiltin<"__builtin_dx_sin_f32">,
+              Intrinsic<[llvm_float_ty], [llvm_float_ty], [IntrNoMem]>;
+}

llvm/lib/IR/Function.cpp

 #include "llvm/IR/InstIterator.h"
 #include "llvm/IR/Instruction.h"
 #include "llvm/IR/IntrinsicInst.h"
 #include "llvm/IR/Intrinsics.h"
 #include "llvm/IR/IntrinsicsAArch64.h"
 #include "llvm/IR/IntrinsicsAMDGPU.h"
 #include "llvm/IR/IntrinsicsARM.h"
 #include "llvm/IR/IntrinsicsBPF.h"
+#include "llvm/IR/IntrinsicsDirectX.h"
 #include "llvm/IR/IntrinsicsHexagon.h"
 #include "llvm/IR/IntrinsicsMips.h"
 #include "llvm/IR/IntrinsicsNVPTX.h"
 #include "llvm/IR/IntrinsicsPowerPC.h"
 #include "llvm/IR/IntrinsicsR600.h"
 #include "llvm/IR/IntrinsicsRISCV.h"
 #include "llvm/IR/IntrinsicsS390.h"
 #include "llvm/IR/IntrinsicsVE.h"