changes in __scatter_base_offsets64_float
modified all gather/scatter instructions in 'knc-i1x16.h'
64 bit gather/scatter fix for knc.h
removed ugly INT32_MIN define (included limits.h) and updated the copyright
undefined printf functions in knc-i1x16.h
Merge pull request #845 from ncos/knc-fails

Fixed 64 bit gather/scatter functions in knc.h and knc-i1x16.h (fixes stability problem on ptr-22.ispc at -O0, which appears as a segfault from time to time)