Use safe_numerics util from PyTorch (#12125)

### Summary
Reopening from #11537
Fixes #11370

### Test plan
Use existing tests since we are doing a drop-in replacement for overflow
checks.

Author: aaron-ang

runtime/core/portable_type/c10/c10/targets.bzl

@@ -112,7 +112,9 @@ def define_common_targets():
                 "util/complex_utils.h",
                 "util/floating_point_utils.h",
                 "util/irange.h",
+                "util/llvmMathExtras.h",
                 "util/overflows.h",
+                "util/safe_numerics.h",
             ],
             exported_preprocessor_flags = [
                 "-DC10_USING_CUSTOM_GENERATED_MACROS",