hack: Try out PGO for kube-apiserver

This commit attempts to try out the new profile
guided optimization feature of golang. It includes
a CPU profile of the API Server taken from a scale
run of a 100 node test.

Signed-off-by: Madhav Jivrajani <madhav.jiv@gmail.com>

hack/lib/golang.sh

@@ -758,6 +758,7 @@ kube::golang::build_binaries_for_platform() {
       -asmflags="${goasmflags}"
       -ldflags="${goldflags}"
       -tags="${gotags:-}"
+      -pgo=${KUBE_ROOT}/hack/profiles/100-node-cpu-apiserver.pprof
     )
     CGO_ENABLED=0 kube::golang::build_some_binaries "${statics[@]}"
   fi
@@ -769,6 +770,7 @@ kube::golang::build_binaries_for_platform() {
       -asmflags="${goasmflags}"
       -ldflags="${goldflags}"
       -tags="${gotags:-}"
+      -pgo=${KUBE_ROOT}/hack/profiles/100-node-cpu-apiserver.pprof
     )
     kube::golang::build_some_binaries "${nonstatics[@]}"
   fi