Revert SymbolFileNativePDB plugin.

This was originally causing some test failures on non-Windows
platforms, which required fixes in the compiler and linker.  After
those fixes, however, other tests started failing.  Reverting
temporarily until I can address everything.

llvm-svn: 344279

lib/CodeGen/AsmPrinter/CodeViewDebug.cpp

@@ -73,7 +73,6 @@
 #include "llvm/Support/Error.h"
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/FormatVariadic.h"
-#include "llvm/Support/Path.h"
 #include "llvm/Support/SMLoc.h"
 #include "llvm/Support/ScopedPrinter.h"
 #include "llvm/Target/TargetLoweringObjectFile.h"
@@ -135,9 +134,7 @@ StringRef CodeViewDebug::getFullFilepath(const DIFile *File) {
 
   // If this is a Unix-style path, just use it as is. Don't try to canonicalize
   // it textually because one of the path components could be a symlink.
-  if (Dir.startswith("/") || Filename.startswith("/")) {
-    if (llvm::sys::path::is_absolute(Filename, llvm::sys::path::Style::posix))
-      return Filename;
+  if (!Dir.empty() && Dir[0] == '/') {
     Filepath = Dir;
     if (Dir.back() != '/')
       Filepath += '/';