ipa: Various diagnostic fixes [PR93797]

ipa: Various diagnostic fixes [PR93797]

As the patch shows, various messages didn't match the field names they are
talking about.

2020-02-18  Jakub Jelinek  <jakub@redhat.com>

	PR ipa/93797
	* cgraph.c (verify_speculative_call): Use speculative_id instead of
	speculative_uid in messages.  Remove trailing whitespace from error
	message.  Use num_speculative_call_targets instead of
	num_speculative_targets in a message.
	(cgraph_node::verify_node): Use call_stmt instead of cal_stmt in
	edge messages and stmt instead of cal_stmt in reference message.