Fix type for resilient enum case global variables

Author: WANGJIEKE

lib/PrintAsClang/PrintClangValueType.cpp

@@ -127,7 +127,7 @@ void ClangValueTypePrinter::printValueTypeDecl(
                              os << typeDecl->getName().str() << '\n';
                              os << "extern \"C\" {\n";
                              for (const auto &pair : elementTagMapping) {
-                               os << "extern int "
+                               os << "extern unsigned "
                                   << pair.second.globalVariableName << ";\n";
                              }
                              os << "}\n";

test/Interop/SwiftToCxx/enums/resilient-enum-in-cxx.swift

@@ -34,8 +34,8 @@ public func printFoo(_ x: Foo) {
 
 // CHECK:         // Tags for resilient enum Foo
 // CHECK-NEXT:    extern "C" {
-// CHECK-NEXT:    extern int $s5Enums3FooO1ayACSdcACmFWC;
-// NEW_CASE-NEXT: extern int $s5Enums3FooO1byACSicACmFWC;
+// CHECK-NEXT:    extern unsigned $s5Enums3FooO1ayACSdcACmFWC;
+// NEW_CASE-NEXT: extern unsigned $s5Enums3FooO1byACSicACmFWC;
 // CHECK-NEXT:    }
 // CHECK-EMPTY:
 // CHECK-NEXT:    } // namespace _impl