Java ergonomics limits heap to 128GB with disabled compressed oops

ADDITIONAL SYSTEM INFORMATION :
Linux, as provided by the openjdk docker image `openjdk:11-jre`

A DESCRIPTION OF THE PROBLEM :
When Java container ergonomic options are used to set MaxHeapSize, they are unable to scale beyond a container of 128GB of RAM. For instance, when running `docker run -m200g -it --rm openjdk:11-jre java -XX:-UseCompressedOops -XX:MaxRAMPercentage=50 -version` Java only allocates a 64GB heap (50% of 128GB limit).

This appears to be due lines 1733-1735 of `src/hotspot/share/runtime/arguments.cpp`, where the effective physical memory is calculated as the minimum of the reported physical memory (in this case from the container limits) and the default value of MaxRAM (128GB):

```
  julong phys_mem =
    FLAG_IS_DEFAULT(MaxRAM) ? MIN2(os::physical_memory(), (julong)MaxRAM)
                            : (julong)MaxRAM;
```

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
docker run -m256g -it --rm openjdk:11-jre java -XX:-UseCompressedOops -XX:MaxRAMPercentage=100 -XshowSettings:vm -version

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
VM settings:
    Max. Heap Size (Estimated): 256.00G
    Using VM: OpenJDK 64-Bit Server VM

openjdk version "11.0.2" 2019-01-15
OpenJDK Runtime Environment (build 11.0.2+9-Debian-3bpo91)
OpenJDK 64-Bit Server VM (build 11.0.2+9-Debian-3bpo91, mixed mode)

ACTUAL -
VM settings:
    Max. Heap Size (Estimated): 128.00G
    Using VM: OpenJDK 64-Bit Server VM

openjdk version "11.0.2" 2019-01-15
OpenJDK Runtime Environment (build 11.0.2+9-Debian-3bpo91)
OpenJDK 64-Bit Server VM (build 11.0.2+9-Debian-3bpo91, mixed mode)


CUSTOMER SUBMITTED WORKAROUND :
When you know you're running in docker, you can set MaxRAM yourself using

-XX:MaxRAM=$(cat /sys/fs/cgroup/memory/memory.limit_in_bytes)

FREQUENCY : always