nir: Add an internal flag to shader_info

Don't print the shader if it's marked internal, unless NIR_PRINT
has been explicitly set to 2 (or higher).

Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6035>

src/compiler/shader_info.h

@@ -98,6 +98,9 @@ typedef struct shader_info {
    /* Descriptive name provided by the client; may be NULL */
    const char *label;
 
+   /* Shader is internal, and should be ignored by things like NIR_PRINT */
+   bool internal;
+
    /** The shader stage, such as MESA_SHADER_VERTEX. */
    gl_shader_stage stage:8;