Rename AllocationSiteInfo to AllocationMemento

This is just a rename change with the exception of a bug found along the way in
CodeStubGraphBuilder<FastCloneShallowArrayStub>::BuildCodeStub(). There, the
intent is to get the boilerplate object from an AllocationSite. But the wrong
HObjectAccess was used. It only succeeds because it happened to be the same
offset :).

BUG=
R=bmeurer@chromium.org

Review URL: https://codereview.chromium.org/19595004

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@15778 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Add gitignore entries for MSVS files

BUG=none
R=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/19500011

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@15779 ce2b1a6d-e550-0410-aec6-3dcde31c8c00