intel/compiler: Refactor disassembly of sources in 3src instruction

Signed-off-by: Sagar Ghuge <sagar.ghuge@intel.com>
Reviewed-by: Matt Turner <mattst88@gmail.com>
47 jobs for !2314 with 3src_imm in 20 minutes and 55 seconds (queued for 9 seconds)
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panfrost-t860-test:arm64 Test
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panfrost-t760-test:armhf Test
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