Prefix COMPILER_IS_MSVC with SWIFT_

include/swift/Basic/EncodedSequence.h

@@ -340,7 +340,7 @@ public:
   template <class ValueType> class Map {
     // Hack: MSVC isn't able to resolve the InlineKeyCapacity part of the
     // template of PrefixMap, so we have to split it up and pass it manually.
-#if COMPILER_IS_MSVC
+#if SWIFT_COMPILER_IS_MSVC
     static const size_t Size = (sizeof(void*) - 1) / sizeof(Chunk);
     static const size_t ActualSize = max<size_t>(Size, 1);