Revert "[Support] Add a way to run a function on a detached thread"

This reverts commit 40668abca4d307e02b33345cfdb7271549ff48d0.
This causes clang tests to fail, as stacksize=0 is being explicitly passed and
is no longer a no-op.

1 files changed, 0 insertions, 9 deletions

diff --git a/llvm/lib/Support/Unix/Unix.h b/llvm/lib/Support/Unix/Unix.h
index 1fc9a414f74..86309b0567f 100644
--- a/llvm/lib/Support/Unix/Unix.h
+++ b/llvm/lib/Support/Unix/Unix.h
@@ -21,7 +21,6 @@
 #include "llvm/Config/config.h"
 #include "llvm/Support/Chrono.h"
 #include "llvm/Support/Errno.h"
-#include "llvm/Support/ErrorHandling.h"
 #include <algorithm>
 #include <assert.h>
 #include <cerrno>
@@ -70,14 +69,6 @@ static inline bool MakeErrMsg(
   return true;
 }
 
-// Include StrError(errnum) in a fatal error message.
-LLVM_ATTRIBUTE_NORETURN static inline void ReportErrnumFatal(const char *Msg,
-                                                             int errnum) {
-  std::string ErrMsg;
-  MakeErrMsg(&ErrMsg, Msg, errnum);
-  llvm::report_fatal_error(ErrMsg);
-}
-
 namespace llvm {
 namespace sys {