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/llvm-ld/llvm-ld.cpp b/tools/llvm-ld/llvm-ld.cpp
index 17035e2..f789b15 100644
--- a/tools/llvm-ld/llvm-ld.cpp
+++ b/tools/llvm-ld/llvm-ld.cpp
@@ -229,8 +229,8 @@
 
   // Create the output file.
   std::string ErrorInfo;
-  raw_fd_ostream Out(FileName.c_str(), /*Binary=*/true, /*Force=*/true,
-                     ErrorInfo);
+  raw_fd_ostream Out(FileName.c_str(), ErrorInfo,
+                     raw_fd_ostream::F_Force | raw_fd_ostream::F_Binary);
   if (!ErrorInfo.empty())
     PrintAndExit(ErrorInfo);
 
@@ -427,8 +427,8 @@
 
   // Output the script to start the program...
   std::string ErrorInfo;
-  raw_fd_ostream Out2(OutputFilename.c_str(), /*Binary=*/false, /*Force=*/true,
-                      ErrorInfo);
+  raw_fd_ostream Out2(OutputFilename.c_str(), ErrorInfo,
+                      llvm::raw_fd_ostream::F_Force);
   if (!ErrorInfo.empty())
     PrintAndExit(ErrorInfo);