glsl: add a shader info field to the gl_program type

And use this field as the source for shader info in the nir_shader
this will allow us to set some of these fields from GLSL directly.

It will also simplify restoring from shader cache and allow the
removal of duplicate fields from GLSL.

Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>

src/compiler/glsl/glsl_to_nir.cpp

@@ -136,7 +136,8 @@ glsl_to_nir(const struct gl_shader_program *shader_prog,
 {
    struct gl_linked_shader *sh = shader_prog->_LinkedShaders[stage];
 
-   nir_shader *shader = nir_shader_create(NULL, stage, options, NULL);
+   nir_shader *shader = nir_shader_create(NULL, stage, options,
+                                          &sh->Program->info);
 
    nir_visitor v1(shader);
    nir_function_visitor v2(&v1);

src/mesa/main/mtypes.h

@@ -43,6 +43,7 @@
 #include "glapi/glapi.h"
 #include "math/m_matrix.h"	/* GLmatrix */
 #include "compiler/shader_enums.h"
+#include "compiler/shader_info.h"
 #include "main/formats.h"       /* MESA_FORMAT_COUNT */
 #include "compiler/glsl/list.h"
 #include "util/bitscan.h"
@@ -1919,6 +1920,8 @@ struct gl_program
 
    struct nir_shader *nir;
 
+   struct shader_info info;
+
    GLbitfield64 InputsRead;     /**< Bitmask of which input regs are read */
    GLbitfield64 DoubleInputsRead;     /**< Bitmask of which input regs are read  and are doubles */
    GLbitfield64 OutputsWritten; /**< Bitmask of which output regs are written */

src/mesa/program/prog_to_nir.c

@@ -1019,6 +1019,12 @@ prog_to_nir(const struct gl_program *prog,
    c->prog = prog;
 
    nir_builder_init_simple_shader(&c->build, NULL, stage, options);
+
+   /* Use the shader_info from gl_program rather than the one nir_builder
+    * created for us. nir_sweep should clean up the other one for us.
+    */
+   c->build.shader->info = (shader_info *) &prog->info;
+
    s = c->build.shader;
 
    if (prog->Parameters->NumParameters > 0) {