implemented macros.getImpl

tests/macros/tgetimpl.nim

@@ -0,0 +1,20 @@
+discard """
+  msg: '''"muhaha"
+proc poo(x, y: int) =
+  echo ["poo"]'''
+"""
+
+import macros
+
+const
+  foo = "muhaha"
+
+proc poo(x, y: int) =
+  echo "poo"
+
+macro m(x: typed): untyped =
+  echo repr x.symbol.getImpl
+  result = x
+
+discard m foo
+discard m poo