Remove dead code. NFC.

This interface was added 2 years ago but users never developed.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@223368 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Support/Process.cpp

@@ -26,25 +26,6 @@ using namespace sys;
 //===          independent code.
 //===----------------------------------------------------------------------===//
 
-// Empty virtual destructor to anchor the vtable for the process class.
-process::~process() {}
-
-self_process *process::get_self() {
-  // Use a function local static for thread safe initialization and allocate it
-  // as a raw pointer to ensure it is never destroyed.
-  static self_process *SP = new self_process();
-
-  return SP;
-}
-
-// The destructor for the self_process subclass must never actually be
-// executed. There should be at most one instance of this class, and that
-// instance should live until the process terminates to avoid the potential for
-// racy accesses during shutdown.
-self_process::~self_process() {
-  llvm_unreachable("This destructor must never be executed!");
-}
-
 /// \brief A helper function to compute the elapsed wall-time since the program
 /// started.
 ///
@@ -63,12 +44,6 @@ static TimeValue getElapsedWallTime() {
 /// create race conditions during program startup or shutdown.
 static volatile TimeValue DummyTimeValue = getElapsedWallTime();
 
-// Implement this routine by using the static helpers above. They're already
-// portable.
-TimeValue self_process::get_wall_time() const {
-  return getElapsedWallTime();
-}
-
 Optional<std::string> Process::FindInEnvPath(const std::string& EnvName,
                                              const std::string& FileName)
 {