PR13200: skip prologue searching for *.function(ADDR).return probes

PR13200: skip prologue searching for *.function(ADDR).return probes

Prologue searching has to be suppressed for all kretprobes/uretprobes
address calculations, or else the *retprobes facility can overwrite
valid stack frame data instead of return addresses.

* tapsets.cxx (query_addr, query_func_info): Perform prologue analysis
  but verbosely ignore results, for .return probes.