This commit introduces notion of 'PerformanceManager' in CLI, suitable
for collecting performance metrics of the compiler. It:
- provides `notifyX{Started/Finished}` API, where 'X' is some
measurable event (previously there were just ad hoc manual time
measurements using System.nanoTime() and stuff)
- collects measurements, so that later they can be reported in an
appropriate way (previously measurements were reported immediately to
MessageCollector as plain strings)
- allows overriding to collect metrics, specific for just one target
platform compilation
Also, common logic of compiler performance statistics collection was
extracted from platform-compilers (K2JVMCompiler) to common classes
(CLICompiler), to allow other platform-compilers (e.g. K2JSCompiler)
re-use it.
Dmitry Savvinov
9996a1bc7e