[Runtime] Fix some type mismatch errors (swiftlang#25790)

Harmless in practice, but still good hygiene.

Author: jrose-apple

include/swift/ABI/Metadata.h

@@ -3358,6 +3358,11 @@ class MetadataAccessFunction {
   explicit operator bool() const {
     return Function != nullptr;
   }
+
+  /// For debugging purposes only.
+  explicit operator void*() const {
+    return reinterpret_cast<void *>(Function);
+  }
 
   /// Invoke with an array of arguments of dynamic size.
   MetadataResponse operator()(MetadataRequest request,

stdlib/public/runtime/Metadata.cpp

@@ -3954,24 +3954,24 @@ template <>
 LLVM_ATTRIBUTE_USED
 void TypeContextDescriptor::dump() const {
   printf("TargetTypeContextDescriptor.\n");
-  printf("Flags: 0x%x.\n", this->Flags);
+  printf("Flags: 0x%x.\n", this->Flags.getIntValue());
   printf("Parent: %p.\n", this->Parent.get());
   printf("Name: %s.\n", Name.get());
-  printf("Access function: %p.\n", getAccessFunction());
+  printf("Access function: %p.\n", static_cast<void *>(getAccessFunction()));
   printf("Fields: %p.\n", Fields.get());
 }
 
 template<>
 LLVM_ATTRIBUTE_USED
 void EnumDescriptor::dump() const {
   printf("TargetEnumDescriptor.\n");
-  printf("Flags: 0x%x.\n", this->Flags);
+  printf("Flags: 0x%x.\n", this->Flags.getIntValue());
   printf("Parent: %p.\n", this->Parent.get());
   printf("Name: %s.\n", Name.get());
-  printf("Access function: %p.\n", getAccessFunction());
+  printf("Access function: %p.\n", static_cast<void *>(getAccessFunction()));
   printf("Fields: %p.\n", Fields.get());
   printf("NumPayloadCasesAndPayloadSizeOffset: 0x%08x "
-         "(payload cases: %u - payload size offset: %u).\n",
+         "(payload cases: %u - payload size offset: %zu).\n",
          NumPayloadCasesAndPayloadSizeOffset,
          getNumPayloadCases(), getPayloadSizeOffset());
   printf("NumEmptyCases: %u\n", NumEmptyCases);

stdlib/public/runtime/ReflectionMirror.mm

@@ -328,7 +328,7 @@ static bool _shouldReportMissingReflectionMetadataWarnings() {
   const FieldDescriptor &descriptor = *fields;
   auto &field = descriptor.getFields()[index];
   // Bounds are always valid as the offset is constant.
-  auto name = field.getFieldName(0, 0, std::numeric_limits<uint64_t>::max());
+  auto name = field.getFieldName(0, 0, std::numeric_limits<uintptr_t>::max());
 
   // Enum cases don't always have types.
   if (!field.hasMangledTypeName())