alias.c: Fix comment typos.

alias.c: Fix comment typos.

	* alias.c: Fix comment typos.
	* basic-block.h: Likewise.
	* c-common.c: Likewise.
	* c-common.h: Likewise.
	* c-decl.c: Likewise.
	* c-opts.c: Likewise.
	* c-pragma.c: Likewise.
	* c-pretty-print.h: Likewise.
	* cfg.c: Likewise.
	* cfganal.c: Likewise.
	* cfgbuild.c: Likewise.
	* cfgcleanup.c: Likewise.
	* cfglayout.c: Likewise.
	* cfgrtl.c: Likewise.
	* convert.c: Likewise.
	* cpphash.h: Likewise.
	* cpplex.c: Likewise.
	* cpplib.h: Likewise.
	* df.h: Likewise.
	* diagnostic.c: Likewise.
	* diagnostic.h: Likewise.
	* dwarf2.h: Likewise.

From-SVN: r61462