tgsi: track max array per file

NOTE IN[] and OUT[] don't need (have?) ArrayID's.. and TEMP[] can
optionally have them.  So we implicitly assume that ArrayID==0 always
exists for each file.  This is why array_max[file] is never less than
zero.

You can tell from indirect_files(_read/written) if the legacy array-
id zero was actually used.

Signed-off-by: Rob Clark <robclark@freedesktop.org>

src/gallium/auxiliary/tgsi/tgsi_scan.c

@@ -165,6 +165,8 @@ tgsi_scan_shader(const struct tgsi_token *tokens,
                = &parse.FullToken.FullDeclaration;
             const uint file = fulldecl->Declaration.File;
             uint reg;
+            if (fulldecl->Declaration.Array)
+               info->array_max[file] = MAX2(info->array_max[file], fulldecl->Array.ArrayID);
             for (reg = fulldecl->Range.First;
                  reg <= fulldecl->Range.Last;
                  reg++) {

src/gallium/auxiliary/tgsi/tgsi_scan.h

@@ -61,6 +61,8 @@ struct tgsi_shader_info
    int file_max[TGSI_FILE_COUNT];  /**< highest index of declared registers */
    int const_file_max[PIPE_MAX_CONSTANT_BUFFERS];
 
+   unsigned array_max[TGSI_FILE_COUNT];  /**< highest index array per register file */
+
    uint immediate_count; /**< number of immediates declared */
    uint num_instructions;