[Bridging PCH] Teach SourceKit to ignore the bridging-pch driver options.

Author: graydon

test/SourceKit/Misc/ignore_bridging_pch.swift

@@ -0,0 +1,7 @@
+// RUN: %sourcekitd-test -req=complete -pos=5:3 %s -- -enable-bridging-pch %s | %FileCheck %s
+// RUN: %sourcekitd-test -req=complete -pos=5:3 %s -- -disable-bridging-pch %s | %FileCheck %s
+
+var s = 10
+s.
+
+// CHECK: littleEndian

tools/SourceKit/lib/SwiftLang/SwiftASTManager.cpp

@@ -370,6 +370,9 @@ static void sanitizeCompilerArgs(ArrayRef<const char *> Args,
       continue;
     if (Arg == "-embed-bitcode")
       continue;
+    if (Arg == "-enable-bridging-pch" ||
+        Arg == "-disable-bridging-pch")
+      continue;
     NewArgs.push_back(CArg);
   }
 }