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
Fix for __shuffle2_float
__sqrt_varying_double
Fix for unsigned cmp for int64
Fix for int64 comparison
Merge
Fix for __cast_zext(__vec16_i64, __vec16_i1)
Fix for count_leading_zeros
Fix for half to float
Changes in cast
Changes in cast_zext
Merge pull request #919 from Vsevolod-Livinskij/knc_header_fix

Knc header fix
Fix in run_tests.py to make it work on Windows
(it was broken by nvxptx target).
Merge pull request #921 from dbabokin/alloy

Fix in run_tests.py to make it work on Windows