Adding location to the Path returned by the literal expander for regex (

#11334)

spec/compiler/codegen/regex_literal_spec.cr

@@ -0,0 +1,17 @@
+require "../../spec_helper"
+
+describe "Code gen: regex literal spec" do
+  it "works in a class variable (#10951)" do
+    run(%(
+      require "prelude"
+      class Foo
+        @@regex = /whatever/
+
+        def self.check_regex
+          @@regex == /whatever/
+        end
+      end
+      Foo.check_regex
+      )).to_b.should eq(true)
+  end
+end

src/compiler/crystal/semantic/literal_expander.cr

@@ -281,9 +281,11 @@ module Crystal
           const = Const.new(@program, @program, const_name, const_value)
 
           @program.types[const_name] = const
+        else
+          const = @program.types[const_name].as(Const)
         end
 
-        Path.new(const_name)
+        Path.new(const_name).at(const.value)
       else
         regex_new_call(node, node_value)
       end