Minor fix for generic DataLayout
Fix for #462: broken debug infor support with LLVM 3.3+
Bringing docs/ispc.rst in sync with ispc.html at web site (some changes were done there directly)
Disable break optimization and change return check to use full mask.
Update break/continue test to use contribution of function mask.
Merge pull request #497 from dbabokin/knc-vector

Minor fix for generic DataLayout
Merge pull request #500 from dbabokin/docs

Bringing docs/ispc.rst in sync with ispc.html at web site
Merge pull request #499 from dbabokin/debug

Fix for #462: broken debug infor support with LLVM 3.3+
Merge pull request #501 from jbrodman/sven

Fix branch tests for breaks and returns.