EXC_CRASH should never be wrapped in another EXC_CRASH

snapshot/mac/exception_snapshot_mac.cc

Index: snapshot/mac/exception_snapshot_mac.cc
diff --git a/snapshot/mac/exception_snapshot_mac.cc b/snapshot/mac/exception_snapshot_mac.cc
index 9a9703a2d287a87d90967399daf19ca48691e21d..8f5bb20fe7e353e8219497e38c261369798c8350 100644
--- a/snapshot/mac/exception_snapshot_mac.cc
+++ b/snapshot/mac/exception_snapshot_mac.cc
@@ -66,17 +66,20 @@ bool ExceptionSnapshotMac::Initialize(ProcessReader* process_reader,
     exception_ = ExcCrashRecoverOriginalException(
         exception_code_0, &exception_code_0, nullptr);
 
-    if (exception_ == EXC_RESOURCE || exception_ == EXC_GUARD) {
-      // These are software exceptions that are never mapped to EXC_CRASH. The
-      // only time EXC_CRASH is generated is for processes exiting due to an
-      // unhandled core-generating signal or being killed by SIGKILL for
-      // code-signing reasons. Neither of these applies to EXC_RESOURCE or
-      // EXC_GUARD. See 10.10 xnu-2782.1.97/bsd/kern/kern_exit.c
-      // proc_prepareexit().
+    if (exception_ == EXC_CRASH ||
+        exception_ == EXC_RESOURCE ||
+        exception_ == EXC_GUARD) {
+      // EXC_CRASH should never be wrapped in another EXC_CRASH.
       //
-      // Receiving these exception types wrapped in EXC_CRASH would lose
-      // information because their code[0] uses all 64 bits (see below) and the
-      // code[0] recovered from EXC_CRASH only contains 20 significant bits.
+      // EXC_RESOURCE and EXC_GUARD are software exceptions that are never
+      // wrapped in EXC_CRASH. The only time EXC_CRASH is generated is for
+      // processes exiting due to an unhandled core-generating signal or being
+      // killed by SIGKILL for code-signing reasons. Neither of these applies to
+      // EXC_RESOURCE or EXC_GUARD. See 10.10 xnu-2782.1.97/bsd/kern/kern_exit.c
+      // proc_prepareexit(). Receiving these exception types wrapped in
+      // EXC_CRASH would lose information because their code[0] uses all 64 bits
+      // (see below) and the code[0] recovered from EXC_CRASH only contains 20
+      // significant bits.
       LOG(WARNING) << base::StringPrintf(
           "exception %s invalid in EXC_CRASH",
           ExceptionToString(exception_, kUseFullName | kUnknownIsNumeric)