add const for pod

compiler-rt/lib/memprof/memprof_rawprofile.cpp

 
 namespace __memprof {
 using ::__sanitizer::Vector;
 using ::llvm::memprof::MemInfoBlock;
 using SegmentEntry = ::llvm::memprof::SegmentEntry;
 using Header = ::llvm::memprof::Header;
 
 namespace {
-template <class T> char *WriteBytes(T &Pod, char *Buffer) {
+template <class T> char *WriteBytes(const T &Pod, const char *Buffer) {
   *(T *)Buffer = Pod;
   return Buffer + sizeof(T);
 }
 
 void RecordStackId(const uptr Key, UNUSED LockedMemInfoBlock *const &MIB,
                    void *Arg) {
   // No need to touch the MIB value here since we are only recording the key.
   auto *StackIds = reinterpret_cast<Vector<u64> *>(Arg);