* function.c: Define current_function_cannot_inline.
(push_function_context_to): Save it.
(pop_function_context_from): Restore it.
* function.h (struct function): Provide it a home.
* output.h: Declare it.
* integrate.c (function_cannot_inline_p): Check it.
* decl.c (cp_finish_decl): Disable inlining of extern inlines
with static variables.