Fix mir-opt tests for big-endian platforms

The test cases src/test/mir-opt/building/custom/consts.rs and
src/test/mir-opt/const_prop/mutable_variable_no_prop.rs are
currently failing on big-endian platforms as the binary encoding
of some constants is hard-coded in the MIR test files.  Fix this
by choosing constant values that have the same encoding on big-
and little-endian platforms.

The test case src/test/mir-opt/issues/issue_75439.rs is failing
as well, but since the purpose of the test is to validate handling
of big-endian integer encodings on a little-endian platform, it does
not make much sense to run it on big-endian platforms in the first
place - we can just ignore it there.

Fixed part of https://github.com/rust-lang/rust/issues/105383.

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