[clang] [llvm] [SystemZ][z/OS] Fix zos_translation_time module flag (PR #210058)

[Abhina Sree via cfe-commits]

abhina-sree wrote:

I created this PR to limit the testcase to z/OS https://github.com/llvm/llvm-project/pull/210341. This is causing errors on arm due to the max limit being different 
`error: environment variable 'SOURCE_DATE_EPOCH' ('253402300799') must be a non-negative decimal integer <= 2147483647`

https://github.com/llvm/llvm-project/pull/210058