Move promote.rs from yktracec to ykrt.

Promotion is a run-time concept that can be used by multiple backends,
so it doesn't make sense for it to live in yktracec.

ykrt/src/lib.rs

@@ -13,6 +13,7 @@ mod deopt;
 mod frame;
 mod location;
 pub(crate) mod mt;
+pub mod promote;
 pub(crate) mod thread_intercept;
 pub mod trace;
 mod ykstats;

ykrt/src/mt.rs

@@ -27,10 +27,10 @@ use crate::print_jit_state;
 use crate::{
     compile::{default_compiler, CompilationError, CompiledTrace, Compiler, GuardId},
     location::{HotLocation, HotLocationKind, Location, TraceFailed},
+    promote,
     trace::{default_tracer, AOTTraceIterator, TraceCollector, Tracer},
     ykstats::{TimingState, YkStats},
 };
-use yktracec::promote;
 
 // The HotThreshold must be less than a machine word wide for [`Location::Location`] to do its
 // pointer tagging thing. We therefore choose a type which makes this statically clear to

yktracec/src/lib.rs

@@ -9,8 +9,6 @@
 use libc::{c_void, size_t};
 use std::ffi::{c_char, c_int};
 
-pub mod promote;
-
 extern "C" {
     pub fn __yktracec_irtrace_compile(
         func_names: *const *const c_char,