byte-compiling defsubst broken

[Dave Love]

rms' last change to bytecomp.el in response to my complaint about
defalias has broken compilation of defsubst under some circumstances.
E.g. after doing an update, compiling printing.el gets errors like

In pr-printify-buffer:
printing.el:3727:4:Warning: attempt to inline `t' before it was defined
printing.el:3728:4:Warning: `t' called as a function

Presumably if adding to `byte-compile-function-environment' is
desirable, `byte-compile-inline-expand' needs to check that the cdr of
the relevant element isn't t, and do nothing if it is.