cast_sext/sext, i64 (l)shl/r and mul
added debug helpers for knc-i1x16.h
Merge branch 'knc-backend-merge' of https://github.com/ncos/ispc into knc-backend-merge
reduce_add_int8/16 implementation fixed
fixed lshr (i64 ...) function implementation
fial_db.txt refresh
Merge pull request #912 from ncos/knc-backend-merge

Knc backend merge
Fail_db update
Merge pull request #913 from Vsevolod-Livinskij/fail_db_update

Fail_db update
Added cstdlib include

the atoi and other functions were not transitively included under clang/llvm3.5
Merge pull request #914 from hansbogert/master

Added cstdlib include
Fix for selfbuild to use both CC and CXX, but not only CC.
Merge pull request #917 from dbabokin/selfbuild

Fix for selfbuild to use both CC and CXX, but not only CC.
Removing -debug-ir functionality for 3.6, as it was removed from LLVM.
Merge pull request #918 from dbabokin/trunk

Removing -debug-ir functionality for 3.6, as it was removed from LLVM.
Fix for max/min_varying_uint/int64
Fix for prefetch
Some changes in max/min_varying_uint/int64
Fix for shuffle2_double
Fix for __shift_i32