Fix unintended switch case fall-through.
Fix unintended switch case fall-through.

Bug 21766174

Change-Id: I1428bcceb2fbf6c649632112f773c3a0625e3775
Reviewed-on: https://swiftshader-review.googlesource.com/3479
Reviewed-by: Nicolas Capens <0612353e1fcebbfd4b302d9337447ca0cdfa9122@google.com>
Tested-by: Nicolas Capens <0612353e1fcebbfd4b302d9337447ca0cdfa9122@google.com>

bkaradzic/SwiftShader,bkaradzic/SwiftShader,google/swiftshader,bkaradzic/SwiftShader,google/swiftshader,google/swiftshader,bkaradzic/SwiftShader,bkaradzic/SwiftShader