PatchInOutImportExport: increase code readability
PatchInOutImportExport: increase code readability

The original code wasted 60% of vertical space, plus returning immediately
from all the case statements makes the logic of the function clearer.

v2: remove redundant break

GPUOpen-Drivers/llpc,GPUOpen-Drivers/llpc,googlestadia/llpc,googlestadia/llpc,GPUOpen-Drivers/llpc,googlestadia/llpc,googlestadia/llpc,GPUOpen-Drivers/llpc,GPUOpen-Drivers/llpc,googlestadia/llpc