Built-in type casting works differently in darwin/amd64 and darwin/arm64 of go1.17.1.

[bang9211]

I have 2 mac, the one uses intel(darwin/amd64) the other one uses M1(darwin/arm64).

I found my test case work differently in other CPU.

Built-in type casting of each version handles overflow differently.

there is no different except for arch(amd64, arm64) in 'go env', 'go version'.

[seankhliao]

See previously #19405 #29468
The result is implementation defined