Fix tests

Author: hokein

clang/unittests/Serialization/SourceLocationEncodingTest.cpp

@@ -34,9 +34,10 @@ void roundTrip(SourceLocation::UIntTy Loc,
   ASSERT_EQ(DecodedEncoded, Loc) << "Decoding " << ActualEncoded;
 }
 
-constexpr SourceLocation::UIntTy MacroBit =
-    1 << (sizeof(SourceLocation::UIntTy) * CHAR_BIT - 1);
-constexpr SourceLocation::UIntTy Big = MacroBit >> 1;
+constexpr SourceLocation::UIntTy MacroBit = 1ull << (SourceLocation::Bits - 1);
+constexpr SourceLocation::UIntTy Big = 1ull << (SourceLocation::Bits - 2);
+constexpr SourceLocation::UIntTy Biggest =
+    llvm::maskTrailingOnes<uint64_t>(SourceLocation::Bits - 1);
 
 TEST(SourceLocationEncoding, Individual) {
   roundTrip(1, 2);