[Libclc-dev] [bug-fix] add_sat cannot handle type larger than i8 correctly.

[Lei Mou]

Patch for sub_sat.

PS: I noticed that in the generated Makefile, file
generic/lib/integer/add_sat.ll was not compiled (ptx/lib/integer/add_sat.ll
was linked into builtin.bc). I'm not quite sure whether the file has some
special purpose, or there is a bug in the build system. So I also added
file sub_sat.ll in the same folder.

Regards
Lei Mou
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