Offline compilation source files should exclude build options hash in filename.

When offline compilation is performed, the OpenCL C source files written include two hashes: one of the file contents, and a second hash containing the build options.

It is appropriate for the build options hash to be included in name of the SPIR-V or binary file that is the output of the compiler, but there is no benefit in including the build options hash in the source file name: doing so leads to the creation of duplicates of the source files.

The figures I have indicate that addressing this would roughly halve the number of CL source files written into the compilation cache of a full CTS run.

Start by locating the offline compilation cache code that constructs OpenCL C source filenames and compare it with SPIR-V and binary naming. Verify that source names no longer vary with build options and that a full CTS run no longer creates duplicate source files.

Written by the indexing model from the issue text.