[ARM][Insn classification refactoring 5/N] Tidy alu/shift instruction classification types

[Sofiane Naci]

Hi,

This patch is the part of the ongoing work of ARM instruction classification
cleanup.

This patch tidies the alu and shift type attribute values by splitting them
for a finer-grained classification and renaming them for clarity.

This has been tested with a full arm-none-eabi toolchain build and
regression run, as well as using random code generation tests to compare the
output versus a baseline compiler.

OK for trunk?

Thanks
Sofiane
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