ir3: rename @store_uniform_ir3 to @store_const_ir3

Uniforms are a legacy thing and this intrinsic was only used to store to
the const file so the new naming is less confusing.

Signed-off-by: Job Noorman <jnoorman@igalia.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/28341>

src/compiler/nir/nir_intrinsics.py

@@ -1403,7 +1403,7 @@ barrier("preamble_end_ir3")
 intrinsic("elect_any_ir3", dest_comp=1, flags=[CAN_ELIMINATE])
 
 # IR3-specific intrinsic for stc. Should be used in the shader preamble.
-store("uniform_ir3", [], indices=[BASE])
+store("const_ir3", [], indices=[BASE])
 
 # IR3-specific intrinsic for loading from a const reg.
 load("const_ir3", [1], indices=[BASE], flags=[CAN_ELIMINATE, CAN_REORDER])