agx: Add agx_size_align_16 helper

Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/14903>

src/asahi/compiler/agx_compiler.h

@@ -61,6 +61,18 @@ enum agx_size {
    AGX_SIZE_64 = 2
 };
 
+static inline unsigned
+agx_size_align_16(enum agx_size size)
+{
+   switch (size) {
+   case AGX_SIZE_16: return 1;
+   case AGX_SIZE_32: return 2;
+   case AGX_SIZE_64: return 4;
+   }
+
+   unreachable("Invalid size");
+}
+
 typedef struct {
    /* Sufficient for as many SSA values as we need. Immediates and uniforms fit in 16-bits */
    unsigned value : 22;