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Change signal, uncaught NSExceptions and Mach exception handlers to prevent re-entrancy with a first-exception-wins approach to prevent concurrent exceptions from trying to use the same cached intermediate dump writer. Uses compare-and-swap to either return early for reentrant signals or to wait indefinitely for anything after the first fatal exception. Change the NSException handler generated from the Objective-C exception preprocessor to not used the cached intermediate dump writer and not use the same first-exception-wins logic. This is useful because the Objective-C exception preprocessor is imperfect and may generate intermediate dumps that are not followed by process termination. Simplify DumpWithoutCrashing's ownership of its intermediate dump writer to be thread safe. Set a handler for SIGPIPE for applications that haven't already ignored or set a handler for SIGPIPE. Bug: crashpad:391 Change-Id: Ia8ae61d50be81910fa0af40325300441d9dc01b6 Reviewed-on: https://chromium-review.googlesource.com/c/crashpad/crashpad/+/3401563 Reviewed-by: Joshua Peraza <jperaza@chromium.org> Commit-Queue: Justin Cohen <justincohen@chromium.org>