native-image (built from latest HEAD) not respecting `-J-Xmx`

[zakkak]

Describe the issue
native-image appears to no longer respect -J-Xmx, this used to work in 21.1.0.

Steps to reproduce the issue

1. Build native-image from source using:

mx --primary-suite-path substratevm --native=native-image --components='Native Image' build

2. Compare 21.1.0 behavior with freshly built 21.2.0-dev

/opt/jvms/graalvm-ce-java11-21.1.0/bin/native-image HelloWorld
...
[helloworld:1471847]      [total]:  32,831.18 ms,  2.36 GB

/opt/jvms/graalvm-ce-java11-21.1.0/bin/native-image -J-Xmx2g HelloWorld
...
[helloworld:1472430]      [total]:  44,002.89 ms,  1.21 GB

$(mx --primary-suite-path substratevm --native=native-image --components='Native Image' graalvm-home)/bin/native-image HelloWorld
...
[helloworld:1470629]      [total]:  34,848.34 ms,  3.29 GB

$(mx --primary-suite-path substratevm --native=native-image --components='Native Image' graalvm-home)/bin/native-image -J-Xmx2g HelloWorld
...
[helloworld:1472626]      [total]:  46,982.46 ms,  3.30 GB

Describe GraalVM and your environment:

• GraalVM version: e279970
• JDK major version: 11
• OS: Fedora 34
• Architecture: AMD64

[olpaw]

I will have a look. @zakkak thanks for reporting!

[zakkak]

Thanks Paul.

Note: It's reproducible with https://github.com/graalvm/graalvm-ce-dev-builds/releases/tag/21.2.0-dev-20210519_2024 as well.

$ /opt/jvms/graalvm-ce-java11-21.2.0-dev/bin/native-image -J-Xmx2g HelloWorld 
...
[helloworld:1477682]      [total]:  40,581.06 ms,  3.28 GB

[zakkak]

Thanks for the fix Paul.