Merge pull request swiftlang#11773 from swiftlang/rdar163952037-swift

[debugserver] Remove unnecessary sleep in MachProcess::AttachForDebug

Author: JDevlieghere

lldb/tools/debugserver/source/MacOSX/MachProcess.mm

@@ -2853,12 +2853,6 @@ static uint64_t bits(uint64_t value, uint32_t msbit, uint32_t lsbit) {
 
     if (err.Success()) {
       m_flags |= eMachProcessFlagsAttached;
-      // Sleep a bit to let the exception get received and set our process
-      // status
-      // to stopped.
-      ::usleep(250000);
-      DNBLog("[LaunchAttach] (%d) Done napping after ptrace(PT_ATTACHEXC)'ing",
-             getpid());
       DNBLogThreadedIf(LOG_PROCESS, "successfully attached to pid %d", pid);
       return m_pid;
     } else {