c-family, c++: Handle EXCESS_PRECISION_EXPR in pretty printers [PR112724]

c-family, c++: Handle EXCESS_PRECISION_EXPR in pretty printers [PR112724]

I've noticed that the c-c++-common/gomp/depobj-3.c test FAILs on i686-linux:
PASS: c-c++-common/gomp/depobj-3.c  -std=c++17  at line 17 (test for warnings, line 15)
FAIL: c-c++-common/gomp/depobj-3.c  -std=c++17  at line 39 (test for warnings, line 37)
PASS: c-c++-common/gomp/depobj-3.c  -std=c++17  at line 43 (test for errors, line 41)
PASS: c-c++-common/gomp/depobj-3.c  -std=c++17  (test for warnings, line 45)
FAIL: c-c++-common/gomp/depobj-3.c  -std=c++17 (test for excess errors)
Excess errors:
/home/jakub/src/gcc/gcc/testsuite/c-c++-common/gomp/depobj-3.c:37:38: warning: the 'destroy' expression ''excess_precision_expr' not supported by dump_expr<expression error>' should
+be the same as the 'depobj' argument 'obj' [-Wopenmp]
The following patch replaces that 'excess_precision_expr' not supported by dump_expr<expression error>
with (float)(((long double)a) + (long double)5)
Still ugly and doesn't actually fix the FAIL (will deal with that
incrementally), but at least valid C/C++ and shows the excess precision
handling in action.

2024-03-26  Jakub Jelinek  <jakub@redhat.com>

	PR c++/112724
gcc/c-family/
	* c-pretty-print.cc (pp_c_cast_expression,
	c_pretty_printer::expression): Handle EXCESS_PRECISION_EXPR like
	NOP_EXPR.
gcc/cp/
	* error.cc (dump_expr): Handle EXCESS_PRECISION_EXPR like NOP_EXPR.