support of LLVM trunk
fixing error for LLVM trunk
Merge pull request #793 from ifilippov/master

Support LLVM trunk (build and errors)
deleting print from 'safe_for_all_mask_off' functions
Merge pull request #794 from ifilippov/master

Deleting print from 'safe_for_all_mask_off' functions
Add error messages for structs containing nested undefined structs
Merge pull request #795 from jbrodman/undefinedmemberstructs

Add error messages for structs containing nested undefined structs
Small fixes for TBB on windows

Changed an #ifdef ISPC_IS_WINDOWS in the definition of TaskInfo to #ifdef ISPC_USE_CONCRT, and fixed two calls to taskCount() that were missing parentheses.
support LLVM
Merge pull request #801 from ifilippov/master

support LLVM trunk
Merge pull request #799 from motiz88/patch-1

Small fixes for TBB on Windows
changing +/-feature regulation to CPU regulation
Merge pull request #802 from ifilippov/avx2

Changing +/-feature regulation to CPU regulation
support LLVM build
Merge pull request #804 from ifilippov/master

support LLVM build
fix LLVM_VERSION for minor versions != 0

llvm version 3.4.2 got converted to 3_4.2 and not 3_4 as intended.

see https://bugs.gentoo.org/show_bug.cgi?id=515114
Merge pull request #807 from ottxor/master

fix LLVM_VERSION for minor versions != 0