Rollup merge of #143339 - 1c3t3a:issue-143332, r=RalfJung

Respect endianness correctly in CheckEnums test suite

The endianness can change the test expectation for the enum check. This change is fixing the failing tests on big endian by changing the tests so that they behave the same as on little endian.

Fixes rust-lang/rust#143332.

Author: tgross35