WASMFS + NODERAWFS fails a bunch of test

[sbc100]

I tried to enable more wasmfs + noderawfs tests in #23617 and got a bunch of errors:

https://app.circleci.com/pipelines/github/emscripten-core/emscripten/40315/workflows/32243af5-fccf-4d17-865b-c534dd4d6749/jobs/895465

Here is a sample of one of the failures (with -g added to get symbols):

$ EMCC_CFLAGS=-g ./test/runner core0.test_unistd_truncate_wasmfs_rawfs
Test suites:
['test_core']
Running test_core: (1 tests)
(checking sanity from test runner)
shared:INFO: (Emscripten: Running sanity checks)
test_unistd_truncate_wasmfs_rawfs (test_core.core0.test_unistd_truncate_wasmfs_rawfs) ... -- begin program output --
f2: 4
st_size: 0

TODO: implement NodeFile::setSize
UNREACHABLE executed
at /emsdk/emscripten/system/lib/wasmfs/backends/node_backend.cpp:121
wasm://wasm/truncate.wasm-00a4bdc2:1


RuntimeError: unreachable
    at truncate.wasm.wasmfs::handle_unreachable(char const*, char const*, unsigned int) (wasm://wasm/truncate.wasm-00a4bdc2:wasm-function[332]:0xc066)
    at truncate.wasm.wasmfs::NodeFile::setSize(long long) (wasm://wasm/truncate.wasm-00a4bdc2:wasm-function[300]:0xaf8a)
    at truncate.wasm.wasmfs::DataFile::Handle::setSize(long long) (wasm://wasm/truncate.wasm-00a4bdc2:wasm-function[481]:0x16543)
    at truncate.wasm.doTruncate(std::__2::shared_ptr<wasmfs::File>&, long long) (wasm://wasm/truncate.wasm-00a4bdc2:wasm-function[508]:0x1a24f)
    at truncate.wasm.__syscall_ftruncate64 (wasm://wasm/truncate.wasm-00a4bdc2:wasm-function[509]:0x1a40a)
    at truncate.wasm.ftruncate (wasm://wasm/truncate.wasm-00a4bdc2:wasm-function[57]:0x2542)
    at truncate.wasm.__original_main (wasm://wasm/truncate.wasm-00a4bdc2:wasm-function[36]:0x104c)
    at truncate.wasm.main (wasm://wasm/truncate.wasm-00a4bdc2:wasm-function[37]:0x1b12)
    at /usr/local/google/home/sbc/dev/wasm/emscripten/out/test/truncate.js:657:12
    at callMain (/usr/local/google/home/sbc/dev/wasm/emscripten/out/test/truncate.js:2747:15)
    at doRun (/usr/local/google/home/sbc/dev/wasm/emscripten/out/test/truncate.js:2799:24)
    at run (/usr/local/google/home/sbc/dev/wasm/emscripten/out/test/truncate.js:2812:5)
    at removeRunDependency (/usr/local/google/home/sbc/dev/wasm/emscripten/out/test/truncate.js:612:7)
    at receiveInstance (/usr/local/google/home/sbc/dev/wasm/emscripten/out/test/truncate.js:760:5)
    at receiveInstantiationResult (/usr/local/google/home/sbc/dev/wasm/emscripten/out/test/truncate.js:778:12)
    at createWasm (/usr/local/google/home/sbc/dev/wasm/emscripten/out/test/truncate.js:806:19)
Thrown at:
    at $wasmfs::handle_unreachable(char const*, char const*, unsigned int) (wasm://wasm/truncate.wasm-00a4bdc2:1:49255)
    at $wasmfs::NodeFile::setSize(long long) (wasm://wasm/truncate.wasm-00a4bdc2:1:44939)
    at $wasmfs::DataFile::Handle::setSize(long long) (wasm://wasm/truncate.wasm-00a4bdc2:1:91460)
    at $doTruncate(std::__2::shared_ptr<wasmfs::File>&, long long) (wasm://wasm/truncate.wasm-00a4bdc2:1:107088)
    at $__syscall_ftruncate64 (wasm://wasm/truncate.wasm-00a4bdc2:1:107531)
    at $ftruncate (wasm://wasm/truncate.wasm-00a4bdc2:1:9539)
    at $__original_main (wasm://wasm/truncate.wasm-00a4bdc2:1:4173)
    at $main (wasm://wasm/truncate.wasm-00a4bdc2:1:6931)
    at /usr/local/google/home/sbc/dev/wasm/emscripten/out/test/truncate.js:657:12
    at callMain (/usr/local/google/home/sbc/dev/wasm/emscripten/out/test/truncate.js:2747:15)


Node.js v20.18.0
-- end program output --