Suppress implicit int-float conversion warning in ROCm build (#29604)
Summary:
```
c10/util/Half.h:467:37: warning: implicit conversion from 'long' to 'double' changes value from 9223372036854775807 to 9223372036854775808 [-Wimplicit-int-float-conversion]
return f < limit::lowest() || f > limit::max();
~ ^~~~~~~~~~~~
c10/util/Half.h:497:41: note: in instantiation of function template specialization 'c10::overflows<long, double>' requested here
if (!std::is_same<To, bool>::value && overflows<To, From>(f)) {
```
Pull Request resolved: https://github.com/pytorch/pytorch/pull/29604
Differential Revision: D18440713
Pulled By: bddppq
fbshipit-source-id: f059b4e37e90fa84308be52ff5e1070ffd04031e
