Merge pull request swiftlang#34839 from drodriguez/windows-msvc2017-constructor-or-initializer-list

[windows][msvc2017] Avoid initializer list constructor ambiguity.

Author: drodriguez

include/swift/Basic/Fingerprint.h

@@ -124,7 +124,7 @@ class Fingerprint final {
   ///
   /// Very well, LLVM. A default value you shall have.
   friend class llvm::yaml::IO;
-  Fingerprint() : Core{DIGEST_LENGTH, '0'} {}
+  Fingerprint() : Core(DIGEST_LENGTH, '0') {}
 };
 
 void simple_display(llvm::raw_ostream &out, const Fingerprint &fp);