mksnapshot and pointer_compression

[Julain20]

I've been trying to build v8 with v8_enable_pointer_compression = true and v8_enable_pointer_compression_shared_cage = false as I want each isolate to have its own heap, run mksnapshot fails because mksnapshot is crashing, this only happens when v8_enable_pointer_compression != v8_enable_pointer_compression_shared_cage

building this for linux x64

[Julain20]

python3 ../../tools/run.py ./mksnapshot --turbo_instruction_scheduling --target_os=linux --target_arch=x64 --embedded_src gen/embedded.S --embedded_variant Default --random-seed 314159265 --startup_blob snapshot_blob.bin --no-native-code-counters --no-turbo-rewrite-far-jumps --no-turbo-verify-allocation --verify-heap
Return code is -11