Atest3: fix indexing CC class name with '_'.

This is a porting of aosp/1234706.
Previously atest couldn't search class name like 'record_cmd',
'cmd_debug_unwind'; this CL is to fix the problem.

Bug: 149261407

Test: m atest-py3 && atest-dev-py3 CtsSimpleperfTestCases:record_cmd#dump_kernel_symbols -cmv
Change-Id: I3a94f5aeb9a019970620b6bdd7cf0bd21fa61326
1 file changed