[PERF2BOLT] Do not issue parsing error on weird build ids

In weird entries we were issueing a parse error. For example, in line 5 here:

6862acc063b0aa86595f52ff81628577df4296ff a.so
6862acc063b0aa86595f52ff81628577df4296ff a.so
6862acc063b0aa86595f52ff81628577df4296ff a.so
db758cb3c970044e78d5a4c99b011708a9995636 bin1
60326683eab31acfd03435d9ed4ff9a8         bin2
7d448e51851b4bdb33eac84f90e74628a14a5f00 b.so
742aa26e0211794356cc25f415c25230a26aa045 c.so

Error reading BOLT data input file: line 89, column 33: malformed field

Fix that.

Reviewed By: #bolt, Amir

Differential Revision: https://reviews.llvm.org/D134822