Fix EuristicInit() in ConvAsmBwdWrW3x3 for 1x1 images. (#1264)
Fix EuristicInit() in ConvAsmBwdWrW3x3 for 1x1 images. (#1264)

* fix-1262(01) Avoid "static_assert (pipe_lines_depth <= img_h)" in asm source.

* fix-1262(02) Better structurize.

ROCmSoftwarePlatform/MIOpen,ROCmSoftwarePlatform/MIOpen,ROCmSoftwarePlatform/MIOpen,ROCmSoftwarePlatform/MIOpen,ROCmSoftwarePlatform/MIOpen