glsl_type: Remove vector and matrix constructor generators

All scalar, vector, and matrix constructors are generated in-line
during AST-to-HIR translation.  There is no longer any need to
generate function versions of the constructors.

src/glsl/ast_to_hir.cpp

@@ -60,7 +60,6 @@ void
 _mesa_ast_to_hir(exec_list *instructions, struct _mesa_glsl_parse_state *state)
 {
    _mesa_glsl_initialize_variables(instructions, state);
-   _mesa_glsl_initialize_constructors(instructions, state);
    _mesa_glsl_initialize_functions(instructions, state);
 
    state->current_function = NULL;