Fix overload resolution for pragmas evaluation (#8902)

Fixes #6448
Fixes #4384

tests/pragmas/foobar.nim

@@ -0,0 +1,3 @@
+import macros
+macro async*(body: untyped): untyped =
+  return newStmtList()

tests/pragmas/t4384.nim

@@ -0,0 +1,3 @@
+macro testMacro(body: untyped): untyped = discard
+macro testMacro(s: string, body: untyped): untyped = discard
+proc foo() {.testMacro: "foo".} = discard

tests/pragmas/t6448.nim

@@ -0,0 +1,16 @@
+discard """
+  line: 9
+  errormsg: '''ambiguous call; both foobar.async'''
+"""
+
+import foobar
+import asyncdispatch, macros
+
+proc bar() {.async.} =
+  echo 42
+
+proc foo() {.async.} = 
+  await bar()
+
+asyncCheck foo()
+runForever()