Raise SIGTRAP rather than abort on failure.

If gdb is attached, it's convenient to be able to continue running.

Change-Id: I3bbb2634d05a08f6bad5425f71da2210dbb80cfe
Reviewed-on: https://boringssl-review.googlesource.com/5125
Reviewed-by: Adam Langley <agl@google.com>
diff --git a/ssl/test/runner/runner.go b/ssl/test/runner/runner.go
index 0895c61..b0eef42 100644
--- a/ssl/test/runner/runner.go
+++ b/ssl/test/runner/runner.go
@@ -562,7 +562,7 @@
 		shim.Env = os.Environ()
 		shim.Env = append(shim.Env, "MALLOC_NUMBER_TO_FAIL="+strconv.FormatInt(mallocNumToFail, 10))
 		if *mallocTestDebug {
-			shim.Env = append(shim.Env, "MALLOC_ABORT_ON_FAIL=1")
+			shim.Env = append(shim.Env, "MALLOC_BREAK_ON_FAIL=1")
 		}
 		shim.Env = append(shim.Env, "_MALLOC_CHECK=1")
 	}