tsan: fix java_symbolization test

We reliably remove bottom libc-guts frames only on linux/glibc.
Some bots failed on this test showing other bottom frames:

 .annobin_libc_start.c libc-start.c (libc.so.6+0x249f4)
 generic_start_main.isra.0 libc-start.c (libc.so.6+0x45b0c)

We can't reliably remove all of possible bottom frames.
So remove the assertion for that.

Differential Revision: https://reviews.llvm.org/D107037