[Bug preprocessor/83602] [8 Regression] ICE in cpp_macro_definition_location(cpp_hashnode*) on invalid code

[dmalcolm at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83602

--- Comment #3 from David Malcolm <dmalcolm at gcc dot gnu.org> ---
Sorry about the breakage.

Patch looks reasonable to me.  Maybe cpp_macro_definition_location should gain
an assertion that CPP_HASHNODE_VALUE_IDX (node) == NTV_MACRO ?