precompile: move precompile_utils logic from C to julia

This helps reveal how badly implemented this was in basically every case
(trim, all, hinting, external) having different bugs by starting to
merge those code paths together. Actually fixing those myriad of issues
is left as an exercise to the reader.

Written with help by Claude.

Author: vtjnash

Compiler/src/Compiler.jl

@@ -53,7 +53,7 @@ using Base: @_foldable_meta, @_gc_preserve_begin, @_gc_preserve_end, @nospeciali
     _array_for, _bits_findnext, _methods_by_ftype, _uniontypes, all, allocatedinline, any,
     argument_datatype, binding_kind, cconvert, copy_exprargs, datatype_arrayelem,
     datatype_fieldcount, datatype_fieldtypes, datatype_layoutsize, datatype_nfields,
-    datatype_pointerfree, decode_effects_override, diff_names, fieldindex,
+    datatype_pointerfree, decode_effects_override, diff_names, fieldindex, visit,
     generating_output, get_nospecializeinfer_sig, get_world_counter, has_free_typevars,
     hasgenerator, hasintersect, indexed_iterate, isType, is_file_tracked, is_function_def,
     is_meta_expr, is_meta_expr_head, is_nospecialized, is_nospecializeinfer, is_defined_const_binding,
@@ -187,6 +187,7 @@ include("typeinfer.jl")
 include("optimize.jl")
 
 include("bootstrap.jl")
+include("precompile.jl")
 include("reflection_interface.jl")
 include("opaque_closure.jl")
 

Compiler/src/bootstrap.jl

@@ -7,6 +7,8 @@
 
 function activate_codegen!()
     ccall(:jl_set_typeinf_func, Cvoid, (Any,), typeinf_ext_toplevel)
+    # Register the new unified compile and emit function
+    ccall(:jl_set_compile_and_emit_func, Cvoid, (Any,), compile_and_emit_native)
     Core.eval(Compiler, quote
         let typeinf_world_age = Base.tls_world_age()
             @eval Core.OptimizedGenerics.CompilerPlugins.typeinf(::Nothing, mi::MethodInstance, source_mode::UInt8) =