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/utils/FileUpdate/FileUpdate.cpp b/utils/FileUpdate/FileUpdate.cpp
index 8d5d6b1..da760e6 100644
--- a/utils/FileUpdate/FileUpdate.cpp
+++ b/utils/FileUpdate/FileUpdate.cpp
@@ -65,8 +65,8 @@
   if (!Quiet)
     outs() << argv[0] << ": Updating '" << OutputFilename
            << "', contents changed.\n";
-  raw_fd_ostream OutStream(OutputFilename.c_str(), /*Binary=*/true,
-                           /*Force=*/true, ErrorStr);
+  raw_fd_ostream OutStream(OutputFilename.c_str(), ErrorStr,
+                           raw_fd_ostream::F_Force|raw_fd_ostream::F_Binary);
   if (!ErrorStr.empty()) {
     errs() << argv[0] << ": Unable to write output '"
            << OutputFilename << "': " << ErrorStr << '\n';