[llvm-profgen][NFC]Fix build failure on different platform

[wlei]

Summary

see titile
Test Plan:
ninja & ninja check-llvm

[hoy]

LGTM.

llvm/docs/CommandGuide/llvm-profgen.rst

 llvm-profgen - LLVM SPGO profile generation tool
-=================================
+=================================================
 
 .. program:: llvm-profgen
 
 SYNOPSIS
 --------
 
 :program:`llvm-profgen` [*commands*] [*options*]
 

llvm/tools/llvm-profgen/CMakeLists.txt

-include_directories(
-  ${LLVM_MAIN_SRC_DIR}/lib/Target/X86
-  ${LLVM_BINARY_DIR}/lib/Target/X86
-  )
+
 set(LLVM_LINK_COMPONENTS
   AllTargetsDescs
   AllTargetsDisassemblers
   Core
   MC
   MCDisassembler
   Object
   Support
   Symbolize
   )
 
 add_llvm_tool(llvm-profgen
   llvm-profgen.cpp
   PerfReader.cpp
   ProfiledBinary.cpp
   )

llvm/tools/llvm-profgen/PerfReader.h

 // Load binaries and read perf trace to parse the events and samples
 class PerfReader {
 
   BinaryMap BinaryTable;
   AddressBinaryMap AddrToBinaryMap; // Used by address-based lookup.
 
   // The parsed MMap event
   struct MMapEvent {
-    pid_t PID = 0;
+    uint64_t PID = 0;
     uint64_t BaseAddress = 0;
     uint64_t Size = 0;
     uint64_t Offset = 0;
     StringRef BinaryPath;
   };
 
   /// Load symbols and disassemble the code of a give binary.
   /// Also register the binary in the binary table.

llvm/tools/llvm-profgen/ProfiledBinary.cpp

 //===-- ProfiledBinary.cpp - Binary decoder ---------------------*- C++ -*-===//
 //
 // 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
 //
 //===----------------------------------------------------------------------===//
 
 #include "ProfiledBinary.h"
 #include "ErrorHandling.h"
-#include "MCTargetDesc/X86MCTargetDesc.h"
 #include "llvm/ADT/Triple.h"
 #include "llvm/Demangle/Demangle.h"
 #include "llvm/Support/CommandLine.h"
 #include "llvm/Support/Format.h"
 #include "llvm/Support/TargetRegistry.h"
 #include "llvm/Support/TargetSelect.h"
-#include "llvm/Support/X86TargetParser.h"
 
 #define DEBUG_TYPE "load-binary"
 
 using namespace llvm;
 
 static cl::opt<bool> ShowDisassembly("show-disassembly", cl::ReallyHidden,
                                      cl::init(false), cl::ZeroOrMore,
                                      cl::desc("Print disassembled code."));