[LLDB]Fix buffer-over-flow bug introduced in 157170 (#159588) If `pr_name` is longer than 16, it would be a non-null terminated string. Assigning it to `std::string m_executable_name` would cause an overflow read. Instead, just copy the name from thread_data.name. To repro, run the `elf-core/TestLinuxCore.py` with asan (Question: why is the new variable needed in the first place? can't the thread_data.name be used?)
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