simpleperf: fix deobfuscating Java symbols.

As reported in https://github.com/android/ndk/issues/1836,
sometimes only the class name is obfuscated, and we should
deobfuscate the class name part in Java symbols.

Bug: 263549058
Test: simpleperf_unit_test
Change-Id: I109fef5a464e0ab47db730169f5d56b62dde9145
2 files changed