Remove sweeper threads

Job based sweeping is enabled since 3.29, so remove the now obsolete
thread based implementation

BUG=none
R=hpayer@chromium.org
LOG=n

Review URL: https://codereview.chromium.org/615933003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24352 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Reserve a page at the beginning of the code range on Win64 for SEH

BUG=v8:3597
R=svenpanne@chromium.org
LOG=n

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24353 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
Don't filter out -O0 for debug configurations

BUG=none
R=svenpanne@chromium.org
LOG=n

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@24354 ce2b1a6d-e550-0410-aec6-3dcde31c8c00