Add diagnostic command to write Linux perf map file

When using the Linux "perf" tool to do system profiling, symbol names of running Java methods cannot be decoded, resulting in unhelpful output such as:

  10.52% [JIT] tid 236748 [.] 0x00007f6fdb75d223

Perf can read a simple text file format describing the mapping between address ranges and symbol names for a particular process:

https://github.com/torvalds/linux/blob/master/tools/perf/Documentation/jit-interface.txt

It's possible to generate this already for Java processes using a JVMTI plugin, e.g. with https://github.com/jvm-profiling-tools/perf-map-agent . However this requires compiling third-party code and then loading the agent into your Java process. It would be more convenient if Hotspot could write this file directly using a diagnostic command. The information required is almost identical to that of the existing Compiler.codelist command.