Add an option to disable native stack dumping on SIGQUIT.

Some of our (stress) run-tests do ANR dumping, which end up
stressing libunwind, that has known problems. To avoid getting
flakes due to libunwind, disable native stack dumping on SIGQUIT
for our run-tests.

bug:27185632
bug:24664297
Change-Id: I69085e48db903d6240448d71666ae2dcd091922e
diff --git a/test/etc/run-test-jar b/test/etc/run-test-jar
index 8245ccf..2db1e6c 100755
--- a/test/etc/run-test-jar
+++ b/test/etc/run-test-jar
@@ -406,6 +406,9 @@
   TMP_DIR_OPTION="-Djava.io.tmpdir=/data/local/tmp"
 fi
 
+# We set DumpNativeStackOnSigQuit to false to avoid stressing libunwind.
+# b/27185632
+# b/24664297
 dalvikvm_cmdline="$INVOKE_WITH $GDB $ANDROID_ROOT/bin/$DALVIKVM \
                   $GDB_ARGS \
                   $FLAGS \
@@ -420,6 +423,7 @@
                   $DEBUGGER_OPTS \
                   $DALVIKVM_BOOT_OPT \
                   $TMP_DIR_OPTION \
+                  -XX:DumpNativeStackOnSigQuit:false \
                   -cp $DEX_LOCATION/$TEST_NAME.jar$SECONDARY_DEX $MAIN $ARGS"
 
 # Remove whitespace.