use name in source module when importing an aliased binding (#43291)

Co-authored-by: Simeon David Schaub <schaub@mit.edu>
(cherry picked from commit 2338f5d)

Author: Pangoraw

src/module.c

@@ -528,7 +528,7 @@ static void module_import_(jl_module_t *to, jl_module_t *from, jl_sym_t *s, jl_s
             }
         }
         else {
-            jl_binding_t *nb = new_binding(s);
+            jl_binding_t *nb = new_binding(b->name);
             nb->owner = b->owner;
             nb->imported = (explici!=0);
             nb->deprecated = b->deprecated;

test/syntax.jl

@@ -2514,6 +2514,7 @@ end
 end
 
 module Mod2
+import ..Mod.x as x_from_mod
 const y = 2
 end
 
@@ -2554,6 +2555,11 @@ import .Mod.@mac as @m
 @test_throws ErrorException eval(:(import .Mod.func as @notmacro))
 @test_throws ErrorException eval(:(using .Mod: @mac as notmacro))
 @test_throws ErrorException eval(:(using .Mod: func as @notmacro))
+
+import .Mod2.x_from_mod
+
+@test @isdefined(x_from_mod)
+@test x_from_mod == Mod.x
 end
 
 import .TestImportAs.Mod2 as M2