agx: Handle 64-bit moves

lower_resinfo generates some 64-bit math, so we need to handle it. Even
though we don't have native 64-bit moves, it's convenient to pretend we
do to avoid special cases in the IR. In particular, modelling 64-bit
mov_imm in the IR means our existing small constant propagation code
works, with zero-extension from 8->64.

Fixes dEQP-GLES3.functional.texture.units.2_units.only_2d_array.*

Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/18813>

src/asahi/compiler/agx_compiler.h

@@ -292,7 +292,7 @@ typedef struct {
    uint8_t nr_srcs;
 
    union {
-      uint32_t imm;
+      uint64_t imm;
       uint32_t writeout;
       uint32_t truth_table;
       uint32_t component;
@@ -755,6 +755,7 @@ void agx_optimizer(agx_context *ctx);
 void agx_lower_pseudo(agx_context *ctx);
 void agx_dce(agx_context *ctx);
 void agx_ra(agx_context *ctx);
+void agx_lower_64bit_postra(agx_context *ctx);
 void agx_pack_binary(agx_context *ctx, struct util_dynarray *emission);
 
 #ifndef NDEBUG