agx: Allow some 8-bit sources

8-bit sources are useful for int8->float32 conversions, which we can do in a
single hardware instruction.

Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/19996>

src/asahi/compiler/agx_compiler.h

@@ -442,6 +442,7 @@ agx_size_for_bits(unsigned bits)
 {
    switch (bits) {
    case 1:
+   case 8:
    case 16: return AGX_SIZE_16;
    case 32: return AGX_SIZE_32;
    case 64: return AGX_SIZE_64;