isaspec: deocde: Make isa_decode_field(..) private

Without this change the isa_decode_field(..) uses the wrong bitmask_t
type (freedreno: array with 2 elements, etnaviv: array with 4 elements)
and weird things happens.

Signed-off-by: Christian Gmeiner <cgmeiner@igalia.com>
Reviewed-by: Rob Clark <robdclark@chromium.org>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/28176>

src/compiler/isaspec/decode.py

@@ -151,6 +151,9 @@ uint64_t_to_bitmask(uint64_t val)
 
 #include "isaspec_decode_decl.h"
 
+static uint64_t
+isa_decode_field(struct decode_scope *scope, const char *field_name);
+
 /*
  * enum tables, these don't have any link back to other tables so just
  * dump them up front before the bitset tables

src/compiler/isaspec/isaspec_decode_decl.h

@@ -51,11 +51,6 @@ struct isa_enum {
  */
 typedef uint64_t (*isa_expr_t)(struct decode_scope *scope);
 
-/**
- * Used by generated expr functions
- */
-uint64_t isa_decode_field(struct decode_scope *scope, const char *field_name);
-
 /**
  * Used by generated decode functions
  */

src/compiler/isaspec/isaspec_decode_impl.c

@@ -544,7 +544,7 @@ resolve_field(struct decode_scope *scope, const char *field_name, size_t field_n
 }
 
 /* This is also used from generated expr functions */
-uint64_t
+static uint64_t
 isa_decode_field(struct decode_scope *scope, const char *field_name)
 {
 	bitmask_t val;