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[ctxprof] Capture sampling info for context roots (#131201)

When we collect a contextual profile, we sample the threads entering its root and only collect on one at a time (see `ContextRoot::Taken`). If we want to compare profiles between contextual profiles, and/or flat profiles, we have a problem: we don't know how to compare the counter values relative to each other. To that end, we add `ContextRoot::TotalEntries`, which is incremented every time a root is entered and serves as multiplier for the counter values collected under that root.

We expose this in the profile and leave the normalization to the user of the profile, for a few reasons:

* it's only needed if reasoning about all profiles in aggregate.
* the goal, in compiler_rt, is to flush out the profile as quickly as possible, and performing multiplications adds an overhead that may not even be necessary if the consumer of the profile doesn't care about combining profiles
* the information itself may be interesting as an indication of relative sampling of various contexts.

[ctxprof] Capture sampling info for context roots

[ctxprof] Capture sampling info for context roots

[ctxprof] Capture sampling info for context roots

rebase

Created using spr 1.3.4

[ctxprof] Capture sampling info for context roots

[ctxprof] Capture sampling info for context roots

[ctxprof] Capture sampling info for context roots

Merge branch 'main' into users/meinersbur/flang_runtime_remove-FLANG_INCLUDE_RUNTIME

Update OB name from `type` to `callee_type`.

Created using spr 1.3.6-beta.1

[𝘀𝗽𝗿] changes introduced through rebase

Created using spr 1.3.6-beta.1

[skip ci]

Update LTO compilation CodeGen flag for call-graph-section.

Created using spr 1.3.6-beta.1

[𝘀𝗽𝗿] changes introduced through rebase

Created using spr 1.3.6-beta.1

[skip ci]

Merge branch 'main' of https://github.com/llvm/llvm-project into remove-old-res-middle

Merge branch 'main' into users/vitalybuka/spr/ir-optimize-cfi-in-writecombinedglobalvaluesummary

Merge remote-tracking branch 'origin/main' into users/ccc03-08-_astmatcher_templateargumentcountis_support_functiondecl_

[ctxprof][nfc] Drop `Section` in `writeFlatSection` (#130654)

It matches `writeContextual`, and also, it's not the whole section that's being written there, just a profile, piecemeal.

[ctxprof][nfc] Drop `Section` in `writeFlatSection`

Rebase, address comments

Created using spr 1.3.5

Merge branch 'main' into users/kparzysz/spr/o03-cancel-directive-name

Merge branch 'main' into users/ylzsx/r-tls-noie

Merge branch 'main' into users/kparzysz/spr/o02-metadirective-flush

Rebase

Created using spr 1.3.5

[ctxprof] Profile section for flat profiles (#129932)

A section for flat profiles (i.e. non-contextual). This is useful for debugging or for intentional cases where a root isn't identified.

This patch adds the reader/writer support. `compiler-rt` changes follow in a subsequent change.

[ctxprof] Profile section for flat profiles

[ctxprof] Profile section for flat profiles

reb

Created using spr 1.3.4

[ctxprof] Profile section for flat profiles

[ctxprof] Prepare profile format for flat profiles (#129626)

The profile format has now a separate section called "Contexts" - there will be a corresponding one for flat profiles. The root has a separate tag because, in addition to not having a callsite ID as all the other context nodes have under it, it will have additional fields in subsequent patches.

The rest of this patch amounts to a bit of refactorings in the reader/writer (for better reuse later) and tests fixups.

[ctxprof] Prepare profile format for flat profiles