Fix missing enum values in switch statements (executorch) (pytorch#15515)

Summary:

`-Wswitch-enum` was introduced in 2024 and is beneficial because it will err when switch statement is missing a case for an enum, even with `default:` present.  This helps alert developers when they add an enum value of all the switch statements that need updating.

These diffs are to help progress the codebase so that we can enable `-Wswitch-enum` by default in `fbobjc`

Reviewed By: shoumikhin

Differential Revision: D85956878

Author: NSProgrammer

extension/apple/ExecuTorch/Exported/ExecuTorchLog.mm

@@ -151,6 +151,7 @@ void et_pal_emit_log_message(et_timestamp_t timestamp,
   case kFatal:
     logType = OS_LOG_TYPE_FAULT;
     break;
+  case kUnknown:
   default:
     logType = OS_LOG_TYPE_DEFAULT;
     break;

extension/tensor/tensor_ptr.h

@@ -13,10 +13,13 @@
 #include <memory>
 #include <vector>
 
+#include <c10/macros/Macros.h>
 #include <executorch/runtime/core/error.h>
 #include <executorch/runtime/core/exec_aten/exec_aten.h>
 #include <executorch/runtime/core/exec_aten/util/scalar_type_util.h>
 
+C10_DIAGNOSTIC_PUSH_AND_IGNORED_IF_DEFINED("-Wswitch-enum")
+
 namespace executorch {
 namespace extension {
 
@@ -445,3 +448,5 @@ runtime::Error resize_tensor_ptr(
 
 } // namespace extension
 } // namespace executorch
+
+C10_DIAGNOSTIC_POP()

runtime/core/exec_aten/util/scalar_type_util.h

@@ -27,8 +27,11 @@
 #include <limits>
 #include <type_traits>
 
+#include <c10/macros/Macros.h>
 #include <executorch/runtime/platform/assert.h>
 
+C10_DIAGNOSTIC_PUSH_AND_IGNORED_IF_DEFINED("-Wswitch-enum")
+
 #ifdef USE_ATEN_LIB
 // Note that a lot of the macros/functions defined in this ScalarTypeUtil.h file
 // are also defined in c10/core/ScalarType.h, which is included via
@@ -1421,3 +1424,5 @@ using ::executorch::runtime::internal::U1;
 } // namespace internal
 } // namespace executor
 } // namespace torch
+
+C10_DIAGNOSTIC_POP()