c-decl.c (grokdeclarator): Correct comments about where storage class specifiers are rejected by grammar...

	* c-decl.c (grokdeclarator): Correct comments about where storage
	class specifiers are rejected by grammar and add corresponding
	asserts.  Diagnose typedefs and parameters declared inline.
	Change warning for inline main to a pedwarn.  Only diagnose inline
	main if hosted.
	(declspecs_add_scspec): Allow duplicate "inline".

testsuite:
	* gcc.dg/declspec-7.c: Don't expect diagnostic for duplicate
	"inline".
	* gcc.dg/declspec-11.c: Update expected messages.
	* gcc.dg/inline-6.c, gcc.dg/inline-7.c, gcc.dg/inline-8.c,
	gcc.dg/inline-9.c, gcc.dg/inline-10.c, gcc.dg/inline-11.c,
	gcc.dg/inline-12.c: New tests.

From-SVN: r87450