Gold-plugin: Broaden scope of get/release_input_file to scope of Module.

Gold-plugin: Broaden scope of get/release_input_file to scope of Module.

Summary:
Move calls to get_input_file and release_input_file out of
getModuleForFile(). Otherwise release_input_file may end up
unmapping a view of the file while the view is still being
used by the Module (on 32-bit hosts).

Fix for PR22482.

Test Plan: Add test using --no-map-whole-files.

Reviewers: rafael, nlewycky

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D7539

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@228842 91177308-0d34-0410-b5e6-96231b3b80d8