Added test for misspelling of inlinable

Author: wickwirew

test/attr/attr_inlinable_close_match.swift

@@ -0,0 +1,4 @@
+// RUN: %target-typecheck-verify-swift
+
+@inlineable public func misspelledInlinable() {}
+// expected-error@-1 {{No attribute named '@inlineable', did you mean '@inlinable'?}}{{2-12=inlinable}}