nir/glsl: make nir_remap_attributes public

As we plan to reuse it for ARB_gl_spirv implementation.

Reviewed-by: Timothy Arceri <tarceri@itsqueeze.com>

src/compiler/nir/nir.h

@@ -2999,6 +2999,9 @@ bool nir_opt_conditional_discard(nir_shader *shader);
 
 void nir_sweep(nir_shader *shader);
 
+void nir_remap_attributes(nir_shader *shader,
+                          const nir_shader_compiler_options *options);
+
 nir_intrinsic_op nir_intrinsic_from_system_value(gl_system_value val);
 gl_system_value nir_system_value_from_intrinsic(nir_intrinsic_op intrin);