test failures on s390x (big-endian)

When running version 95 tests on a big-endian machine like s390x, I get the following test error:

./check.py --binaryen-bin s390x-redhat-linux-gnu/bin
warning: no mozjs found (did not check native wasm support nor asm.js validation)
warning: no interpreter provided (did not test spec interpreter validation)
...
.. fuzz-exec_all-features.wast
executing:  /builddir/build/BUILD/binaryen-version_95/s390x-redhat-linux-gnu/bin/wasm-opt --fuzz-exec --all-features split.wast --print
executing:  /builddir/build/BUILD/binaryen-version_95/s390x-redhat-linux-gnu/bin/wasm-opt --fuzz-exec --all-features split.wast --print --debug
executing:  /builddir/build/BUILD/binaryen-version_95/s390x-redhat-linux-gnu/bin/wasm-opt --fuzz-exec --all-features split.wast --print
executing:  /builddir/build/BUILD/binaryen-version_95/s390x-redhat-linux-gnu/bin/wasm-opt --fuzz-exec --all-features split.wast --print
executing:  /builddir/build/BUILD/binaryen-version_95/s390x-redhat-linux-gnu/bin/wasm-opt --fuzz-exec --all-features split.wast --print --debug
executing:  /builddir/build/BUILD/binaryen-version_95/s390x-redhat-linux-gnu/bin/wasm-opt --fuzz-exec --all-features split.wast --print
executing:  /builddir/build/BUILD/binaryen-version_95/s390x-redhat-linux-gnu/bin/wasm-opt --fuzz-exec --all-features split.wast --print
executing:  /builddir/build/BUILD/binaryen-version_95/s390x-redhat-linux-gnu/bin/wasm-opt --fuzz-exec --all-features split.wast --print --debug
executing:  /builddir/build/BUILD/binaryen-version_95/s390x-redhat-linux-gnu/bin/wasm-opt --fuzz-exec --all-features split.wast --print
executing:  /builddir/build/BUILD/binaryen-version_95/s390x-redhat-linux-gnu/bin/wasm-opt --fuzz-exec --all-features split.wast --print
executing:  /builddir/build/BUILD/binaryen-version_95/s390x-redhat-linux-gnu/bin/wasm-opt --fuzz-exec --all-features split.wast --print --debug
executing:  /builddir/build/BUILD/binaryen-version_95/s390x-redhat-linux-gnu/bin/wasm-opt --fuzz-exec --all-features split.wast --print
executing:  /builddir/build/BUILD/binaryen-version_95/s390x-redhat-linux-gnu/bin/wasm-opt --fuzz-exec --all-features split.wast --print
executing:  /builddir/build/BUILD/binaryen-version_95/s390x-redhat-linux-gnu/bin/wasm-opt --fuzz-exec --all-features split.wast --print --debug
executing:  /builddir/build/BUILD/binaryen-version_95/s390x-redhat-linux-gnu/bin/wasm-opt --fuzz-exec --all-features split.wast --print
incorrect output, diff:
--- /builddir/build/BUILD/binaryen-version_95/test/passes/fuzz-exec_all-features.txt
+++ actual
@@ -66,7 +66,7 @@
 [fuzz-exec] calling unaligned_notify
 [trap unaligned atomic operation]
 [fuzz-exec] calling wrap_cmpxchg
-[LoggingExternalInterface logging 42]
+[LoggingExternalInterface logging 704643072]
 [fuzz-exec] calling oob_notify
 [trap final > memory: 18446744073709551512 > 65514]
 (module
@@ -135,7 +135,7 @@
 [fuzz-exec] calling unaligned_notify
 [trap unaligned atomic operation]
 [fuzz-exec] calling wrap_cmpxchg
-[LoggingExternalInterface logging 42]
+[LoggingExternalInterface logging 704643072]
 [fuzz-exec] calling oob_notify
 [trap final > memory: 18446744073709551512 > 65514]
 [fuzz-exec] comparing aligned_for_size
Traceback (most recent call last):
  File "/builddir/build/BUILD/binaryen-version_95/./check.py", line 403, in <module>
    sys.exit(main())
  File "/builddir/build/BUILD/binaryen-version_95/./check.py", line 386, in main
    TEST_SUITES[test]()
  File "/builddir/build/BUILD/binaryen-version_95/scripts/test/wasm_opt.py", line 75, in test_wasm_opt
    shared.fail_if_not_identical_to_file(actual, expected_file)
  File "/builddir/build/BUILD/binaryen-version_95/scripts/test/shared.py", line 348, in fail_if_not_identical_to_file
    fail_if_not_identical(actual, f.read(), fromfile=expected_file)
  File "/builddir/build/BUILD/binaryen-version_95/scripts/test/shared.py", line 337, in fail_if_not_identical
    fail(actual, expected, fromfile=fromfile)
  File "/builddir/build/BUILD/binaryen-version_95/scripts/test/shared.py", line 332, in fail
    fail_with_error("incorrect output, diff:\n\n%s" % diff_str)
  File "/builddir/build/BUILD/binaryen-version_95/scripts/test/shared.py", line 320, in fail_with_error
    raise Exception(msg)
Exception: incorrect output, diff:
--- /builddir/build/BUILD/binaryen-version_95/test/passes/fuzz-exec_all-features.txt
+++ actual
@@ -66,7 +66,7 @@
 [fuzz-exec] calling unaligned_notify
 [trap unaligned atomic operation]
 [fuzz-exec] calling wrap_cmpxchg
-[LoggingExternalInterface logging 42]
+[LoggingExternalInterface logging 704643072]
 [fuzz-exec] calling oob_notify
 [trap final > memory: 18446744073709551512 > 65514]
 (module
@@ -135,7 +135,7 @@
 [fuzz-exec] calling unaligned_notify
 [trap unaligned atomic operation]
 [fuzz-exec] calling wrap_cmpxchg
-[LoggingExternalInterface logging 42]
+[LoggingExternalInterface logging 704643072]
 [fuzz-exec] calling oob_notify
 [trap final > memory: 18446744073709551512 > 65514]
 [fuzz-exec] comparing aligned_for_size

Start by running ./check.py --binaryen-bin s390x-redhat-linux-gnu/bin and inspect test/passes/fuzz-exec_all-features.txt alongside the failure path in scripts/test/wasm_opt.py and scripts/test/shared.py. Compare the expected logging value 42 with the s390x result 704643072 and trace the big-endian behavior. Done means the relevant test passes on s390x without changing unrelated expected output.