[IndirectCallPromotion] Don't strip ".__uniq." suffix when it strips

".llvm." suffix.

Currently IndirectCallPromotion simply strip everything after the first "."
in LTO mode, in order to match the symbol name and the name with ".llvm."
suffix in the value profile. However, if -funique-internal-linkage-names
and thinlto are both enabled, the name may have both ".__uniq." suffix and
".llvm." suffix, and the current mechanism will strip them both, which is
unexpected. The patch fixes the problem.

Differential Revision: https://reviews.llvm.org/D98389