Change raw_fd_ostream to take flags as an optional bitmask 
instead of as two bools.  Use this to add a F_Append flag
which has the obvious behavior.

Other unrelated changes conflated into this patch:

1. REmove EH stuff from llvm-dis and llvm-as, the try blocks
   are dead.
2. Simplify the filename inference code in llvm-as/llvm-dis,
   because raw_fd_ostream does the right thing with '-'.
3. Switch machine verifier to use raw_ostream instead of ostream
   (Which is the thing that needed append in the first place).




git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@79807 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/tools/gold/gold-plugin.cpp b/tools/gold/gold-plugin.cpp
index 9554b8a..16b3471 100644
--- a/tools/gold/gold-plugin.cpp
+++ b/tools/gold/gold-plugin.cpp
@@ -362,10 +362,9 @@
     (*message)(LDPL_ERROR, "%s", ErrMsg.c_str());
     return LDPS_ERR;
   }
-  raw_fd_ostream *objFile = new raw_fd_ostream(uniqueObjPath.c_str(),
-                                               /*Binary=*/true,
-                                               /*Force=*/true,
-                                               ErrMsg);
+  raw_fd_ostream *objFile = 
+    new raw_fd_ostream(uniqueObjPath.c_str(), ErrMsg,
+                       raw_fd_ostream::F_Force|raw_fd_ostream::F_Binary);
   if (!ErrMsg.empty()) {
     delete objFile;
     (*message)(LDPL_ERROR, "%s", ErrMsg.c_str());