selftests/bpf: Test stack arguments across may_goto

Each test passes arguments 6-8 on the stack. Thus it uses all the registers
in which the JITs of x86-64, arm64 and riscv64 pass stack arguments.

  may_goto                                     then
  -------------------------------------------  ---------------------------
  70000 iterations in the callee               the callee reads the args
  the time is up in the callee                 the callee reads the args
  70000 iterations in the caller, after the    the caller calls the callee
  writes of the args

70000 iterations have one look at the clock. Without the fix on x86-64 the
second test fails, and the first test fails with the hpet clocksource. The
third test passes there. The result depends on the registers that the C
code uses.

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://patch.msgid.link/20261027190314.1440199-20-alexei.starovoitov@gmail.com

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