[FileSpec] Delegate common operations to llvm::sys::path

With the recent changes in FileSpec to use LLVM's path style, it is
possible to delegate a bunch of common path operations to LLVM's path
helpers. This means we only have to maintain a single implementation and
at the same time can benefit from the efforts made by the rest of the
LLVM community.

This is part one of a set of patches. There was no obvious way to split
this so I just worked from top to bottom.

Differential revision: https://reviews.llvm.org/D48084

llvm-svn: 334615
diff --git a/lldb/source/Core/Debugger.cpp b/lldb/source/Core/Debugger.cpp
index c8f3b92..9d68d84 100644
--- a/lldb/source/Core/Debugger.cpp
+++ b/lldb/source/Core/Debugger.cpp
@@ -605,8 +605,8 @@
                    const FileSpec &file_spec) {
   Status error;
 
-  static ConstString g_dylibext("dylib");
-  static ConstString g_solibext("so");
+  static ConstString g_dylibext(".dylib");
+  static ConstString g_solibext(".so");
 
   if (!baton)
     return FileSpec::eEnumerateDirectoryResultQuit;