crypto: keyObject.export() crashes on C++ assertion with ed25519 key

[mscdex]

• Version: master
• Platform: Linux
• Subsystem: crypto

> crypto.createPublicKey(`-----BEGIN PRIVATE KEY-----\nMC4CAQAwBQYDK2VwBCIEIHXLsXm1lsq5HtyqJwQyFmpfEluuf0KOqP6DqMgGxxDL\n-----END PRIVATE KEY-----`).export()
./node[26040]: ../src/node_crypto.cc:3466:v8::Local<v8::String> node::crypto::KeyObject::GetAsymmetricKeyType() const: Assertion `false' failed.
 1: 0x5635a08bb190 node::Abort() [./node]
 2: 0x5635a08bb22e  [./node]
 3: 0x5635a09c1315 node::crypto::KeyObject::GetAsymmetricKeyType(v8::FunctionCallbackInfo<v8::Value> const&) [./node]
 4: 0x5635a0b5491e  [./node]
 5: 0x5635a0b558e8 v8::internal::Builtin_HandleApiCall(int, v8::internal::Object**, v8::internal::Isolate*) [./node]
 6: 0x5635a1a51fee  [./node]
Aborted (core dumped)

Using crypto.createPrivateKey() with the same key fails in the same way when exporting.

[mscdex]

PR incoming