Fix clang cc1as crash for asm output

[Steven Wu]

Hi Rafael

This looks like a fallout from your ostream rewrite. In clang cc1as_main, when the output file type is “asm”, AsmStreamer owns a formatted_raw_ostream which has a reference to FDOS (raw_ostream), so AsmStreamer must be closed before FDOS. Here is the patch.

Thanks
Steven

From f930e3d8a8c7da74de6000bb3b80f90efc5615ff Mon Sep 17 00:00:00 2001
From: Steven Wu <stevenwu at apple.com>
Date: Thu, 23 Jul 2015 14:48:24 -0700
Subject: [PATCH 1/2] Fix the cc1as crash when it outputs assembly

---
 tools/driver/cc1as_main.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/tools/driver/cc1as_main.cpp b/tools/driver/cc1as_main.cpp
index aa92541..fd0fbb4 100644
--- a/tools/driver/cc1as_main.cpp
+++ b/tools/driver/cc1as_main.cpp
@@ -406,6 +406,9 @@ static bool ExecuteAssembler(AssemblerInvocation &Opts,
     Failed = Parser->Run(Opts.NoInitialTextSection);
   }
 
+  // Close Streamer first.
+  // It might have a reference to the output stream.
+  Str.reset();
   // Close the output stream early.
   BOS.reset();
   FDOS.reset();
-- 
2.3.8 (Apple Git-58)

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