don't allow AsmTempLabel in UNREG mode (Trac #14264)

Authored by trofi on Sep 24 2017, 6:14 AM.

Description

don't allow AsmTempLabel in UNREG mode (Trac Trac #14264)

AsmTempLabel is really a label that describes
label in assembly output (or equivalent like LLVM IR).

Unregisterised build does not handle it correctly.

This change does not fix UNREG build failure in
Ticket Trac #14264 but reverts back to panic:

pprCLbl AsmTempLabel

Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>