Fix setup of immediate types for gen4 disasm.
Fix setup of immediate types for gen4 disasm.

Caught by clang.

dlespiau/checkmate-test-igt,ChrisCummins/intel-gpu-tools,chenxianqin/intel-gpu-tools,rib/intel-gpu-tools,ChrisCummins/intel-gpu-tools,erikarn/intel-gpu-tools,yipdw/intel-gpu-tools,mv0/intel-gpu-tools,chenxianqin/intel-gpu-tools,erikarn/intel-gpu-tools,rib/intel-gpu-tools,chenxianqin/intel-gpu-tools,dlespiau/checkmate-test-igt,tiagovignatti/intel-gpu-tools,tiagovignatti/intel-gpu-tools,mv0/intel-gpu-tools,rib/intel-gpu-tools,erikarn/intel-gpu-tools,rib/intel-gpu-tools,dlespiau/checkmate-test-igt,tiagovignatti/intel-gpu-tools,tiagovignatti/intel-gpu-tools,dlespiau/checkmate-test-igt,yipdw/intel-gpu-tools,ChrisCummins/intel-gpu-tools,yipdw/intel-gpu-tools,chenxianqin/intel-gpu-tools,ChrisCummins/intel-gpu-tools,erikarn/intel-gpu-tools,mv0/intel-gpu-tools,mv0/intel-gpu-tools,yipdw/intel-gpu-tools