Simplify buildInlineBufferDesc
Simplify buildInlineBufferDesc

Common up the code that initializes the common parts of the buffer
descriptor dword 3.

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