PR jit/66539: Add parentheses as needed to gcc_jit_object_get_debug_string

PR jit/66539: Add parentheses as needed to gcc_jit_object_get_debug_string

gcc/jit/ChangeLog:
	PR jit/66539
	* jit-recording.c: Within namespace gcc::jit::recording::
	(rvalue::get_debug_string_parens): New function.
	(binary_op::make_debug_string): Update to mimic C precedence
	rules.
	(binary_op_precedence): New array.
	(binary_op::get_precedence): New function.
	(comparison::make_debug_string): Update to mimic C precedence
	rules.
	(comparison_precedence): New array.
	(comparison::get_precedence): New function.
	(cast::make_debug_string): Update to mimic C precedence rules.
	(call::make_debug_string): Likewise.
	(call_through_ptr::make_debug_string): Likewise.
	(array_access::make_debug_string): Likewise.
	(access_field_of_lvalue::make_debug_string): Likewise.
	(access_field_rvalue::make_debug_string): Likewise.
	(dereference_field_rvalue::make_debug_string): Likewise.
	(dereference_rvalue::make_debug_string): Likewise.
	(get_address_of_lvalue::make_debug_string): Likewise.
	* jit-recording.h: Within namespace gcc::jit::recording::
	(precedence): New enum.
	(rvalue::rvalue): Initialize field "m_parenthesized_string".
	(rvalue::get_debug_string_parens): New method.
	(rvalue::get_precedence): New pure virtual function.
	(rvalue::m_parenthesized_string): New field.
	(param::get_precedence): New function.
	(global::get_precedence): New function.
	(memento_of_new_rvalue_from_const::get_precedence): New function.
	(memento_of_new_string_literal::get_precedence): New function.
	(unary_op::get_precedence): New function.
	(binary_op::get_precedence): New function.
	(comparison::get_precedence): New function.
	(cast::get_precedence): New function.
	(call::get_precedence): New function.
	(call_through_ptr::get_precedence): New function.
	(array_access::get_precedence): New function.
	(access_field_of_lvalue::get_precedence): New function.
	(access_field_rvalue::get_precedence): New function.
	(dereference_field_rvalue::get_precedence): New function.
	(dereference_rvalue::get_precedence): New function.
	(get_address_of_lvalue::get_precedence): New function.
	(local::get_precedence): New function.

gcc/testsuite/ChangeLog:
	PR jit/66539
	* jit.dg/all-non-failing-tests.h: Add test-debug-strings.c.
	* jit.dg/test-debug-strings.c: New test case.
	* jit.dg/test-quadratic.c (make_calc_discriminant): Verify that
	the discriminant has a sane debug string.

From-SVN: r224531