proc/native: fix target program crash caused by call injection (linux) (#1538)
RestoreRegisters on linux would also restore FS_BASE and GS_BASE, if the target goroutine migrated to a different thread during the call injection this would result in two threads of the target process pointing to the same TLS area which would greatly confuse the target runtime, leading to fatal panics with nonsensical stack traces. Other backends are unaffected: - native/windows doesn't store the TLS in the same CONTEXT struct as the other register values. - native/darwin doesn't support function calls (and wouldn't store the TLS value in the same struct) - gdbserial/rr doesn't support function calls (because it's a recording) - gsdbserial/lldb extracts the value of TLS by executing code in the target process.
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