ftime-trace: add tracing of CTFE !

[JohanEngelen]

--ftime-trace was not yet tracing CTFE, a major oversight... With these changes it now does trace CTFE. The start, and function calls during CTFE. I think that gives the user enough info to pinpoint where time is spent.

Testcase gives this output:

@rikkimax

[JohanEngelen]

about CI errors: Perhaps dmd-2.102.2-beta.1 miscompiles ?
(it's annoying to test with DMD on macOS, because I have to rebuild LLVM for x86_64 arch...... also with prebuilt llvm for x86_64 I'm running into other linking trouble because of arm/x86_64 mixed link inputs...)
I can disable the testing for LLVM <=10, just to satisfy CI. But latest DMD might really be miscompiling...

[JohanEngelen]

about CI errors: Perhaps dmd-2.102.2-beta.1 miscompiles ?

Pff, I'm a bit rusty it seems... version (LDC) ---> version (IN_LLVM). doh!

[JohanEngelen]

@kinke I'd like to get this in the release, automerge enabled.

[JohanEngelen]

@rikkimax This should be available in ldc-latest-ci (install.sh), see here: https://github.com/ldc-developers/ldc/releases/tag/CI

[rikkimax]

There appears to be something wrong with that build (even without time-trace), its take >3 minutes to build what should take sub-40 seconds normally. Was it not optimized?

Perfetto can no longer work with the resulting trace, when scrolled out. Ah I think I know why, CTFE start: [33, 33, 33, 33, 3 ... giant Unicode table here. Yeahhhh the name field needs to be shrunk. If the name is bigger than what a symbol name can be please truncate. After all how many kilobytes do you need to know its a table?

I've included a screenshot of a problem module, and yeahhhh that tells a much better story.

[JohanEngelen]

There appears to be something wrong with that build (even without time-trace), its take >3 minutes to build what should take sub-40 seconds normally. Was it not optimized?

Perfetto can no longer work with the resulting trace, when scrolled out. Ah I think I know why, CTFE start: [33, 33, 33, 33, 3 ... giant Unicode table here. Yeahhhh the name field needs to be shrunk. If the name is bigger than what a symbol name can be please truncate. After all how many kilobytes do you need to know its a table?

please submit bug reports whenever you find something ;-). (this one I can remember)