[ Runtime ] Can't invoke Hack script with exotic characters in the file path

[lexidor]

Describe the bug

HHVM can't execute Hack code (tested with hello world) if the file path contains exotic characters (tested with （╯°□°）╯︵┻━┻).

Standalone code, or other way to reproduce the problem

mkdir （╯°□°）╯︵┻━┻
cd （╯°□°）╯︵┻━┻
touch .hhconfig
mkdir src
echo '<<__EntryPoint>> function main(): void {echo "Hello, World!";}' > src/TableFlip.hack
hhvm src/TableFlip.hack

Steps to reproduce the behavior:

1. Execute src/TableFlip.hack

Expected behavior
This script should execute and print Hello, World! to the console.

Actual behavior

Fatal error: Uncaught Error: (Invalid_argument Char.chr) in /path/to/（╯°□°）╯︵┻━┻/src/TableFlip.hack:-1
Stack trace:
#0 {main}

Please note that the exception is thrown from line -1.

Environment

• Operating system

Ubuntu 20.04

• Installation method

apt-get with dl.hhvm.com repository

• HHVM Version

HipHop VM 4.56.1 (rel)
Compiler: 1593547575_929404933
Repo schema: d1ae8e21bf3419a65f12a010527485564e719d07
hackc-0b10dd000fc9b454637d8dffc67fb542d231572c-4.56.1

Additional context
Wanted to reproduce #7146 in modern hhvm builds, so I made a joke directory name.
This prevented me from executing any code from that directory.
#7146 (comment)