bug#48264: [PATCH v3 02/15] Take offset not idx in PER_BUFFER_VALUE_P

[Eli Zaretskii]

> From: Spencer Baugh <sbaugh@catern.com>
> Date: Thu,  6 May 2021 17:33:33 -0400
> Cc: Spencer Baugh <sbaugh@catern.com>
> 
> This improves clarity and allows us to more easily change how
> PER_BUFFER_VALUE_P works.
> 
> * src/buffer.h (PER_BUFFER_VALUE_P): Move to be in scope of
> PER_BUFFER_IDX.  Take offset instead of idx, and perform the common
> "idx == -1" check internally.
> * src/data.c (store_symval_forwarding, set_internal)
> (set_default_internal, Flocal_variable_p):
> * src/buffer.c (buffer_local_variables_1): Pass offset not idx to
> PER_BUFFER_VALUE_P, and remove idx == -1 checks.

This moves an INLINE function from a header to a C file, which I'd
prefer to avoid (due to all kind of subtle issues with inline
functions).  Can't you move PER_BUFFER_IDX to the header instead?

Thanks.