* Added cl_khr_fp16 extension support for test_decorate from spirv_new, work in progres
* Complemented test_decorate saturation test to support cl_khr_fp16 extension (issue #142)
* Fixed clang format
* scope of modifications:
-changed naming convention of saturation .spvasm files related to
test_decorate of spirv_new
-restored float to char/uchar saturation tests
-few minor corrections
* fix ranges for half testing
* fix formating
* one more formatting fix
* remove unused function
* use isnan instead of std::isnan
isnan is currently implemented as a macro, not as a function, so
we can't use std::isnan.
* fix Clang warning about inexact conversion
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Co-authored-by: Ben Ashbaugh <ben.ashbaugh@intel.com>