pretty-print, expand: Print [must tail call] for CALL_EXPRs and fix up maybe_complain_about_tail_call [PR119718]

Andrew P. mentioned earlier he'd like to see in the dump files a note
whether it was a failed must tail call or not.
We already print that on the tailc/musttail pass side, because
print_gimple_stmt prints [must tail call] after the musttail calls.
The first hunk below does it for GENERIC CALL_EXPRs too (which is needed
for the expand diagnostics).  That isn't enough though, because the
error on it was done first and then CALL_EXPR_MUST_TAIL_CALL flag was
cleared, so the dump didn't have it anymore.  I've reordered the
dump printing with error, so that it works properly.

2025-04-14  Jakub Jelinek  <jakub@redhat.com>

	PR tree-optimization/119718
	* tree-pretty-print.cc (dump_generic_node) <case CALL_EXPR>: Dump
	also CALL_EXPR_MUST_TAIL_CALL flag.
	* calls.cc (maybe_complain_about_tail_call): Emit error about
	CALL_EXPR_MUST_TAIL_CALL only after emitting dump message, not before
	it.

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