Do not load from shared memory inside if branches
Do not load from shared memory inside if branches

hipcc generates slower jumps and duplicated loads
instead of simple conditional moves (v_cndmask_b32).

Co-authored-by: Gergely Meszaros <c255ecbe71911eccdfe33b8c0c659cd71e377472@streamhpc.com>

DTolm/VkFFT,DTolm/VkFFT,DTolm/VkFFT