[FileSystem] Move path resolution logic out of FileSpec

This patch removes the logic for resolving paths out of FileSpec and
updates call sites to rely on the FileSystem class instead.

Differential revision: https://reviews.llvm.org/D53915

llvm-svn: 345890

lldb/source/Breakpoint/BreakpointResolverFileLine.cpp

@@ -92,7 +92,7 @@ BreakpointResolver *BreakpointResolverFileLine::CreateFromStructuredData(
     return nullptr;
   }
 
-  FileSpec file_spec(filename, false);
+  FileSpec file_spec(filename);
 
   return new BreakpointResolverFileLine(bkpt, file_spec, line_no, column,
                                         offset, check_inlines, skip_prologue,