Mysterious missing symbols in object files

[George Russell]

Whenever I try to compile anything non-trivial, for example green-card, I
get lots of complaints from the linker about missing symbols.  It looks as if
this is due to some flakey handling in the latest version of supposedly inlined
functions.  Example - the symbol
   PrelGHC_addr2Integerzh_closure
is referred to in various places (for example, in the object code for CPUTime,
though I can't work out why), but I can't find a definition for it anywhere.