clang/win plugin: Do not warn on dllexport inline move constructors.
This is like https://codereview.chromium.org/
1129093002 , but for move
constructors instead of copy constructors.
Also add a test for https://codereview.chromium.org/
1129093002 (and this).
Since testing dllexport on non-win requires a -target and can't depend on
system headers (windows system headers aren't installed where we run tests),
convert the test the new test was based on to be standalone (we should do
this for all tests, http://crbug.com/486559)
BUG=483986,486559
Review URL: https://codereview.chromium.org/
1137973002
Cr-Commit-Position: refs/heads/master@{#329208}