glsl: rename _restrict to restrict_flag

To fix MSVC compile breakage.  Evidently, _restrict is an MSVC keyword,
though the docs only mention __restrict (with two underscores).

Note: we may want to also rename _volatile to volatile_flag to be
consistent.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=74900
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>

src/glsl/ast.h

@@ -473,7 +473,7 @@ struct ast_type_qualifier {
 	 unsigned explicit_image_format:1;
 	 unsigned coherent:1;
 	 unsigned _volatile:1;
-	 unsigned _restrict:1;
+	 unsigned restrict_flag:1;
 	 unsigned read_only:1; /**< "readonly" qualifier. */
 	 unsigned write_only:1; /**< "writeonly" qualifier. */
 	 /** \} */

src/glsl/ast_function.cpp

@@ -120,7 +120,7 @@ verify_image_parameter(YYLTYPE *loc, _mesa_glsl_parse_state *state,
       return false;
    }
 
-   if (actual->data.image._restrict && !formal->data.image._restrict) {
+   if (actual->data.image.restrict_flag && !formal->data.image.restrict_flag) {
       _mesa_glsl_error(loc, state,
                        "function call parameter `%s' drops "
                        "`restrict' qualifier", formal->name);

src/glsl/ast_to_hir.cpp

@@ -2232,7 +2232,7 @@ apply_image_qualifier_to_variable(const struct ast_type_qualifier *qual,
       var->data.image.write_only |= qual->flags.q.write_only;
       var->data.image.coherent |= qual->flags.q.coherent;
       var->data.image._volatile |= qual->flags.q._volatile;
-      var->data.image._restrict |= qual->flags.q._restrict;
+      var->data.image.restrict_flag |= qual->flags.q.restrict_flag;
       var->data.read_only = true;
 
       if (qual->flags.q.explicit_image_format) {

src/glsl/builtin_functions.cpp

@@ -4293,7 +4293,7 @@ builtin_builder::_image_prototype(const glsl_type *image_type,
    image->data.image.write_only = flags & IMAGE_FUNCTION_WRITE_ONLY;
    image->data.image.coherent = true;
    image->data.image._volatile = true;
-   image->data.image._restrict = true;
+   image->data.image.restrict_flag = true;
 
    return sig;
 }

src/glsl/glsl_parser.yy

@@ -1655,7 +1655,7 @@ storage_qualifier:
    {
       STATIC_ASSERT(sizeof($$.flags.q) <= sizeof($$.flags.i));
       memset(& $$, 0, sizeof($$));
-      $$.flags.q._restrict = 1;
+      $$.flags.q.restrict_flag = 1;
    }
    | READONLY
    {

src/glsl/ir.cpp

@@ -1558,7 +1558,7 @@ ir_variable::ir_variable(const struct glsl_type *type, const char *name,
    this->data.image.write_only = false;
    this->data.image.coherent = false;
    this->data.image._volatile = false;
-   this->data.image._restrict = false;
+   this->data.image.restrict_flag = false;
 
    if (type != NULL) {
       if (type->base_type == GLSL_TYPE_SAMPLER)
@@ -1668,7 +1668,7 @@ ir_function_signature::qualifiers_match(exec_list *params)
           a->data.image.write_only != b->data.image.write_only ||
           a->data.image.coherent != b->data.image.coherent ||
           a->data.image._volatile != b->data.image._volatile ||
-          a->data.image._restrict != b->data.image._restrict) {
+          a->data.image.restrict_flag != b->data.image.restrict_flag) {
 
 	 /* parameter a's qualifiers don't match */
 	 return a->name;

src/glsl/ir.h

@@ -698,7 +698,7 @@ public:
          bool write_only; /**< "writeonly" qualifier. */
          bool coherent;
          bool _volatile;
-         bool _restrict;
+         bool restrict_flag;
 
          /** Image internal format if specified explicitly, otherwise GL_NONE. */
          GLenum format;