By replacing invokeExact with invokeBasic in all the type-checked invokes in java.lang.invoke.BootstrapMethodInvokers we get rid of some calls to MethodHandleNatives.linkMethod.

I believe [~jvernee] strongly hinted at this when reviewing some earlier code changes in BootstrapMethodInvoker, but I completely misunderstood the hint and looked in the wrong place. There is a decent, one-off win on various startup tests by doing this.