CompilationPolicyChoice is an old flag that can be used to pick between two different policies for C2: the current default (0 / SimpleCompPolicy) and a legacy variant (1 / StackWalkCompPolicy).

StackWalkCompPolicy was the default until it was concluded it added startup/warmup overhead without any real peak performance benefits over the SimpleCompPolicy (JDK-6191063). The flag has not seen widespread use and is not explicitly tested.

Deprecate, obsolete and remove. This deprecation will be accompanied by a CSR.