typos: Fix various typos - mainly misspelled reference* [PR99304]

typos: Fix various typos - mainly misspelled reference* [PR99304]

The PR is about a typo in handle_malloc_attribute diagnostic message,
but grepping around I found many other cases and while fixing those I've
noticed a couple of other typos.

2021-02-28  Jakub Jelinek  <jakub@redhat.com>

	PR c/99304
	* ipa.c (symbol_table::remove_unreachable_nodes): Fix a comment
	typo - referneced -> referenced.
	* tree.c (component_ref_size): Fix comment typo -
	refernce -> reference.
	* tree-ssa-alias.c (access_path_may_continue_p): Fix comment typo -
	traling -> trailing.
	(aliasing_component_refs_p): Fix comment typos -
	refernce -> reference and refernece -> reference and
	traling -> trailing.
	(nonoverlapping_refs_since_match_p): Fix comment typo -
	referneces -> references.
	* doc/invoke.texi (--param modref-max-bases): Fix a typo -
	referneces -> references.
gcc/c-family/
	* c-attribs.c (handle_malloc_attribute): Fix a typo in inform
	message - refernced -> referenced.  Remove superfluous space before
	closing paren of function calls.
gcc/lto/
	* lto-symtab.c (lto_symtab_prevailing_virtual_decl): Fix comment
	typos - refernced -> referenced and
	devirtualizaiton -> devirtualization.