ponyc: depend on llvm@3.9

Closes #11205.

Signed-off-by: ilovezfs <ilovezfs@icloud.com>

Formula/ponyc.rb

@@ -3,6 +3,7 @@ class Ponyc < Formula
   homepage "http://www.ponylang.org"
   url "https://github.com/ponylang/ponyc/archive/0.11.3.tar.gz"
   sha256 "0b88009c636669192baee71589cd37885fe0f39bd24008ccc20780d925c18a2c"
+  revision 1
 
   bottle do
     cellar :any_skip_relocation
@@ -12,7 +13,7 @@ class Ponyc < Formula
   end
 
   depends_on :macos => :yosemite
-  depends_on "llvm@3.8"
+  depends_on "llvm@3.9"
   depends_on "libressl"
   depends_on "pcre2"
   needs :cxx11
@@ -28,7 +29,7 @@ class Ponyc < Formula
 
   def install
     ENV.cxx11
-    ENV["LLVM_CONFIG"]="#{Formula["llvm@3.8"].opt_bin}/llvm-config-3.8"
+    ENV["LLVM_CONFIG"] = "#{Formula["llvm@3.9"].opt_bin}/llvm-config"
     system "make", "config=release", "destdir=#{prefix}", "install", "verbose=1"
   end