Rename reexecute_instruction() to kvm_unprotect_and_retry_on_failure() to
make the intent and purpose of the helper much more obvious.

No functional change intended.
Reviewed-by: Yuan Yao <yuan.yao@intel.com>
Link: https://lore.kernel.org/r/20240831001538.336683-20-seanjc@google.comSigned-off-by: Sean Christopherson <seanjc@google.com>