Use `quick_exit` instead of `_exit` (except for error handling).

Replace every occurrence of `_exit` (for cases other than pure error
handling) with `quick_exit`, in order to allow functions registered
with `at_quick_exit` to be called before exiting.

In particular, this change will allow LLVM's code coverage profile
dumping routine to be called before exiting ART processes.

Test: mmma art
Test: ART tests
Bug: 186576313
Change-Id: Ia9b0dbb471e2a26600c8bd23f7567931d050fc9d

1 files changed, 4 insertions, 2 deletions

diff --git a/dalvikvm/dalvikvm.cc b/dalvikvm/dalvikvm.cc
index 4808a1fa09..f2cc225e8b 100644
--- a/dalvikvm/dalvikvm.cc
+++ b/dalvikvm/dalvikvm.cc
@@ -215,6 +215,8 @@ extern "C" const char *__asan_default_options() {
 
 int main(int argc, char** argv) {
   // Do not allow static destructors to be called, since it's conceivable that
-  // daemons may still awaken (literally).
-  _exit(art::dalvikvm(argc, argv));
+  // daemons may still awaken (literally); but still have functions registered
+  // with `at_quick_exit` (for instance LLVM's code coverage profile dumping
+  // routine) be called before exiting.
+  quick_exit(art::dalvikvm(argc, argv));
 }