RFR: 8356027: Print enhanced compilation timings [v2]

[Aleksey Shipilev]

On Fri, 2 May 2025 16:27:27 GMT, Ashutosh Mehra <asmehra at openjdk.org> wrote:

> While you are refactoring this, if you can also add a title to the `PrintCompilation` output. like the following, it would immensely helpful as it would avoid the need to dig up the code to understand what these numbers stand for.

Added in new commit. I thought about printing the legend every n-th time, but there is a major wrinkle: the generic `print_impl` gets passed a stream, so we do not know if we have printed header there or not. Or whether indeed we should print a header there. So I opted to print it once from compiler initialization code.

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PR Comment: https://git.openjdk.org/jdk/pull/24984#issuecomment-2851362344