Currently in the OpenJDK corpus of JMH microbenchmarks all different @Fork(jvmArgs/-Append/-Prepend = ) options are used.

143 uses of jvmArgsAppend
59 uses of jvmArgsPrepend
18 uses of jvmArgs

This makes for some surprises and makes it easy to override configured flags when setting up and running chunks of microbenchmarks.

I propose we consolidate on @Fork(jvmArgs = ..) as the preferred option in microbenchmarks, leaving `-jvmArgsAppend` and `-jvmArgsPrepend` free for use by ops.