cfgcleanup: Move check for dest containing non-local label/eh landing pad to tree_forwarder_block_p

I noticed this check was in both remove_forwarder_block and remove_forwarder_block_with_phi but
were slightly different in that eh landing pad was not being checked for remove_forwarder_block_with_phi
when it definite should be.
This folds the check into tree_forwarder_block_p instead as it is called right before hand anyways.

The eh landing pad check was added to the non-phi one by r0-98233-g28e5ca15b76773 but missed the phi variant;
I am not sure if it could show up there but it is better to have one common code than having two copies of
slightly different checks.

Bootstrapped and tested on x86_64-linux-gnu.

gcc/ChangeLog:

	* tree-cfgcleanup.cc (remove_forwarder_block_with_phi): Remove check on non-local label.
	(remove_forwarder_block): Remove check on non-label/eh landing pad.
	(tree_forwarder_block_p): Add check on lable for an eh landing pad.

Signed-off-by: Andrew Pinski <andrew.pinski@oss.qualcomm.com>

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