[lldb] Conditionalize context_switch attribute based on kernel version

[root-kidik]

I build llvm toolchain with linux-headers 4.2, but get error, while compiling lldb

llvm-project/lldb/source/Plugins/Process/Linux/Perf.cpp:345:8: error: 'struct perf_event_attr' has no member named 'context_switch' attr.context_switch = 1%3b

can we replace or disable this functionality in lldb with older linux-headers?

https://man7.org/linux/man-pages/man2/perf_event_open.2.html
context_switch (since Linux 4.3)

[llvmbot]

@llvm/issue-subscribers-lldb

Author: Nikita (root-kidik)

I build llvm toolchain with `linux-headers 4.2`, but get error, while compiling lldb ``` llvm-project/lldb/source/Plugins/Process/Linux/Perf.cpp:345:8: error: 'struct perf_event_attr' has no member named 'context_switch' attr.context_switch = 1%3b ``` can we replace or disable this functionality in lldb with older `linux-headers`?

https://man7.org/linux/man-pages/man2/perf_event_open.2.html
context_switch (since Linux 4.3)