xref JuliaLang/julia#57074

The old `Compiler.Timings` infrastructure is disabled, so here we
leverage the same `newly_compiled` infrastructure used during
precompilation.

With the "classic" inference timing disabled, PrecompileTools and
SnoopCompile are non-functional on 1.12 & master. #57074 added timing
data to the CodeInstances themselves, which should help restore
SnoopCompile. However, without the tree structure provided by the old
inference timing system, we still need a way to tag MethodInstances that
get inferred inside `PrecompileTools.@compile_workload` blocks.

This adds a simple mechanism modeled after `@trace_compile` that
switching to tagging MethodInstances in `jl_push_newly_inferred`.
JuliaLang/PrecompileTools.jl#47 contains the
corresponding changes to PrecompileTools.jl.

With the "classic" inference timing disabled, PrecompileTools and
SnoopCompile are non-functional on 1.12 & master. #57074 added timing
data to the CodeInstances themselves, which should help restore
SnoopCompile. However, without the tree structure provided by the old
inference timing system, we still need a way to tag MethodInstances that
get inferred inside `PrecompileTools.@compile_workload` blocks.

This adds a simple mechanism modeled after `@trace_compile` that
switches to tagging MethodInstances in `jl_push_newly_inferred`.
JuliaLang/PrecompileTools.jl#47 contains (or
will contain) the corresponding changes to PrecompileTools.jl.

With the "classic" inference timing disabled, PrecompileTools and
SnoopCompile are non-functional on 1.12 & master. #57074 added timing
data to the CodeInstances themselves, which should help restore
SnoopCompile. However, without the tree structure provided by the old
inference timing system, we still need a way to tag MethodInstances that
get inferred inside `PrecompileTools.@compile_workload` blocks.

This adds a simple mechanism modeled after `@trace_compile` that
switches to tagging MethodInstances in `jl_push_newly_inferred`.
JuliaLang/PrecompileTools.jl#47 contains (or
will contain) the corresponding changes to PrecompileTools.jl.

(cherry picked from commit c89b1ff)

Adds 4 new Float16 fields to CodeInstance to replace Compiler.Timings
with continually collected and available measurements.

Sample results on a novel method signature:

julia> @time code_native(devnull, ÷, dump_module=false, (Int32,
UInt16));
0.006262 seconds (3.62 k allocations: 186.641 KiB, 75.53% compilation
time)

    julia> b = which(÷, (Int32, UInt16)).specializations[6].cache
    CodeInstance for MethodInstance for div(::Int32, ::UInt16)

    julia> reinterpret(Float16, b.time_infer_self)
    Float16(0.0002766)

    julia> reinterpret(Float16, b.time_infer_total)
    Float16(0.00049)

    julia> reinterpret(Float16, b.time_infer_cache_saved)
    Float16(0.02774)

    julia> reinterpret(Float16, b.time_compile)
    Float16(0.003773)

Closes #56115

(cherry picked from commit 18b5d8f)

xref JuliaLang/julia#57074

The old `Compiler.Timings` infrastructure is disabled, so here we
leverage the same `newly_compiled` infrastructure used during
precompilation.

Because the implementation is so fundamentally different,
this makes the upcoming Julia 1.12 the minimum required
version for new development in this package.

---------

Co-authored-by: Jameson Nash <vtjnash@gmail.com>
Co-authored-by: Kristoffer <kcarlsson89@gmail.com>

Co-authored-by: Cédric Belmant <cedric.belmant@juliahub.com>

Adds 4 new Float16 fields to CodeInstance to replace Compiler.Timings
with continually collected and available measurements.

Sample results on a novel method signature:

julia> @time code_native(devnull, ÷, dump_module=false, (Int32,
UInt16));
0.006262 seconds (3.62 k allocations: 186.641 KiB, 75.53% compilation
time)

    julia> b = which(÷, (Int32, UInt16)).specializations[6].cache
    CodeInstance for MethodInstance for div(::Int32, ::UInt16)

    julia> reinterpret(Float16, b.time_infer_self)
    Float16(0.0002766)

    julia> reinterpret(Float16, b.time_infer_total)
    Float16(0.00049)

    julia> reinterpret(Float16, b.time_infer_cache_saved)
    Float16(0.02774)

    julia> reinterpret(Float16, b.time_compile)
    Float16(0.003773)

Closes JuliaLang#56115