Fix memory leaks under vm/test

[simon-camp]

No description provided.

[GMNGeoffrey]

Huh I wonder why these weren't caught by the asan build and listed in #5715

[simon-camp]

These must have been introduced fairly recently, in the last two weeks or so.

[GMNGeoffrey]

Yeah but we have an asan presubmit that should be catching such things. How did you detect them?

[simon-camp]

These failed with my local asan build, but I was also surprised the bot didn't fail.

[GMNGeoffrey]

Can you post the command you ran? I can diff it against what the bot is doing

[simon-camp]

I'm using the VSCode CMake extension so this might be overly verbose 🤷‍♂️

Configure
/usr/local/bin/cmake --no-warn-unused-cli -DIREE_HAL_DRIVERS_TO_BUILD=all -DIREE_TARGET_BACKENDS_TO_BUILD=all -DCMAKE_C_COMPILER:STRING=clang-10 -DCMAKE_CXX_COMPILER:STRING=clang++-10 -DIREE_USE_LINKER:STRING=lld-10 -DIREE_ENABLE_ASAN:STRING=ON -DIREE_ENABLE_EMITC:STRING=OFF -DCMAKE_EXPORT_COMPILE_COMMANDS:BOOL=TRUE -DCMAKE_BUILD_TYPE:STRING=Debug -H/home/user/repos/iree -B/home/user/repos/iree/build/ASAN-NoEmitC -G Ninja

Build
/usr/local/bin/cmake --build /home/user/repos/iree/build/ASAN-NoEmitC --config Debug --target all -j 50 --