Orderfile: correct --manual-libname plumbing.

Small fix to correct usage of --manual-libname.

Change-Id: Idba891ed7e193a42bd355812972f9c649876f214
Reviewed-on: https://chromium-review.googlesource.com/c/1349263Reviewed-by: Benoit L <lizeb@chromium.org>
Commit-Queue: Matthew Cary <mattcary@chromium.org>
Cr-Commit-Position: refs/heads/master@{#610605}

tools/cygprofile/orderfile_generator_backend.py

@@ -726,7 +726,7 @@ class OrderfileGenerator(object):
       with file(self._options.manual_symbol_offsets) as f:
         symbol_offsets = [int(x) for x in f.xreadlines()]
       processor = process_profiles.SymbolOffsetProcessor(
-          self._options.manual_libname)
+          self._compiler.manual_libname)
       generator = cyglog_to_orderfile.OffsetOrderfileGenerator(
           processor, cyglog_to_orderfile.ObjectFileProcessor(
               self._options.manual_objdir))