Simplify libjulia usage (#1687)

* Simplify libjulia usage

* try fix

* fx

* champ

* tmp

* fix

* bump

Author: wsmoses

src/compiler/orcv1.jl

@@ -131,7 +131,8 @@ function resolver(name, ctx)
 
         found = false
         val = nothing
-        hnd = Libdl.dlopen("libjulia")
+
+        hnd = unsafe_load(cglobal(:jl_libjulia_handle, Ptr{Cvoid}))    
         for (k, v) in Compiler.JuliaGlobalNameMap
             if "ejl_"*k == name
                 val = unsafe_load(Base.reinterpret(Ptr{Ptr{Cvoid}}, Libdl.dlsym(hnd, k)))

src/compiler/orcv2.jl

@@ -132,8 +132,11 @@ function __init__()
         jit[] = CompilerInstance(lljit, nothing, nothing)
     end
 
-    hnd = Libdl.dlopen("libjulia")
-
+    hnd = @static if VERSION >= v"1.10"
+        unsafe_load(cglobal(:jl_libjulia_handle, Ptr{Cvoid}))
+    else
+        Libdl.dlopen("libjulia")
+    end
     for (k, v) in Compiler.JuliaGlobalNameMap
         ptr = unsafe_load(Base.reinterpret(Ptr{Ptr{Cvoid}}, Libdl.dlsym(hnd, k)))
         LLVM.define(jd_main, absolute_symbol_materialization(mangle(lljit, "ejl_"*k), ptr))