From a9c3c176ad741b9c2b915abc59dd977d0299c53f Mon Sep 17 00:00:00 2001
From: Sam McCall <sammccall@google.com>
Date: Wed, 23 Oct 2019 15:34:48 +0200
Subject: Reland "[Support] Add a way to run a function on a detached thread""

This reverts commit 7bc7fe6b789d25d48d6dc71d533a411e9e981237.
The immediate callers have been fixed to pass nullopt where appropriate.
---
 llvm/lib/Support/CrashRecoveryContext.cpp | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

(limited to 'llvm/lib/Support/CrashRecoveryContext.cpp')

diff --git a/llvm/lib/Support/CrashRecoveryContext.cpp b/llvm/lib/Support/CrashRecoveryContext.cpp
index 9d13fce9cc5..8d8529b474f 100644
--- a/llvm/lib/Support/CrashRecoveryContext.cpp
+++ b/llvm/lib/Support/CrashRecoveryContext.cpp
@@ -404,7 +404,10 @@ bool CrashRecoveryContext::RunSafelyOnThread(function_ref<void()> Fn,
                                              unsigned RequestedStackSize) {
   bool UseBackgroundPriority = hasThreadBackgroundPriority();
   RunSafelyOnThreadInfo Info = { Fn, this, UseBackgroundPriority, false };
-  llvm_execute_on_thread(RunSafelyOnThread_Dispatch, &Info, RequestedStackSize);
+  llvm_execute_on_thread(RunSafelyOnThread_Dispatch, &Info,
+                         RequestedStackSize == 0
+                             ? llvm::None
+                             : llvm::Optional<unsigned>(RequestedStackSize));
   if (CrashRecoveryContextImpl *CRC = (CrashRecoveryContextImpl *)Impl)
     CRC->setSwitchedThread();
   return Info.Result;
-- 
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