[Clang][Driver] After default -fintegrated-cc1, make llvm::report_fatal_error() generate preprocessed source + reproducer.sh again.

Added a test for #pragma clang __debug llvm_fatal_error to test for the original issue.
Added llvm::sys::Process::Exit() and replaced ::exit() in places where it was appropriate. This new function would call the current CrashRecoveryContext if one is running on the same thread; or call ::exit() otherwise.

Fixes PR44705.

Differential Revision: https://reviews.llvm.org/D73742

(cherry picked from commit faace365088a2a3a4cb1050a9facfc34a7a56577)

2 files changed, 4 insertions, 2 deletions

diff --git a/clang/tools/driver/cc1_main.cpp b/clang/tools/driver/cc1_main.cpp
index b551e9f4cf8..6d1a67f2a4f 100644
--- a/clang/tools/driver/cc1_main.cpp
+++ b/clang/tools/driver/cc1_main.cpp
@@ -36,6 +36,7 @@
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/ManagedStatic.h"
 #include "llvm/Support/Path.h"
+#include "llvm/Support/Process.h"
 #include "llvm/Support/Signals.h"
 #include "llvm/Support/TargetRegistry.h"
 #include "llvm/Support/TargetSelect.h"
@@ -69,7 +70,7 @@ static void LLVMErrorHandler(void *UserData, const std::string &Message,
   // We cannot recover from llvm errors.  When reporting a fatal error, exit
   // with status 70 to generate crash diagnostics.  For BSD systems this is
   // defined as an internal software error.  Otherwise, exit with status 1.
-  exit(GenCrashDiag ? 70 : 1);
+  llvm::sys::Process::Exit(GenCrashDiag ? 70 : 1);
 }
 
 #ifdef CLANG_HAVE_RLIMITS
diff --git a/clang/tools/driver/cc1as_main.cpp b/clang/tools/driver/cc1as_main.cpp
index 53c8a9d642d..e1041f91bfd 100644
--- a/clang/tools/driver/cc1as_main.cpp
+++ b/clang/tools/driver/cc1as_main.cpp
@@ -46,6 +46,7 @@
 #include "llvm/Support/Host.h"
 #include "llvm/Support/MemoryBuffer.h"
 #include "llvm/Support/Path.h"
+#include "llvm/Support/Process.h"
 #include "llvm/Support/Signals.h"
 #include "llvm/Support/SourceMgr.h"
 #include "llvm/Support/TargetRegistry.h"
@@ -547,7 +548,7 @@ static void LLVMErrorHandler(void *UserData, const std::string &Message,
   Diags.Report(diag::err_fe_error_backend) << Message;
 
   // We cannot recover from llvm errors.
-  exit(1);
+  sys::Process::Exit(1);
 }
 
 int cc1as_main(ArrayRef<const char *> Argv, const char *Argv0, void *MainAddr) {