build: enabling pgo at configure

This modification allows for compiling with profiled guided
optimization (pgo) using the flags
--enable-pgo-generate and --enable-pgo-use.

Refs: https://github.com/nodejs/node/issues/21583
Refs: https://github.com/nodejs/node/issues/1409
PR-URL: https://github.com/nodejs/node/pull/21596


Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Denys Otrishko <shishugi@gmail.com>