Hi,

On windows, the v8 version 11.5 build fails when generating the snapshot with 
following error:

C:/Users/jean-claude/Documents/src/google/depot_tools/bootstrap-2@3_8_10_chromium_26_bin/python3/bin/python3.exe
 ../../tools/run.py ./mksnapshot --turbo_instruction_scheduling --target_os=win 
--target_arch=x64 --embedded_src gen/embedded.S --embedded_variant Default 
--random-seed 314159265 --startup_blob snapshot_blob.bin 
--no-native-code-counters
Return code is 2147483651

These are the options used (args.gn):
is_official_build = true
target_cpu = "x64"
is_component_build = true
use_custom_libcxx = false
chrome_pgo_phase = false
treat_warnings_as_errors = false
fatal_linker_warnings = false
symbol_level = 0

When using `is_debug=false` instead of `is_official_build = true` it builds 
fine, but it comes with performance regressions compared to older version 9.3 
build with `is_official_build = true`.

If using either `is_component_build = false` or `use_custom_libcxx = true`, it 
builds fine too, however it's not really an option as I need a dll build and I 
need to use Microsoft's C++ standard library because third party dependencies 
prevents us to use libc++.

I also tried version 11.4 and 11.6 and they give the same error.

Any hints in how to diagnose/fix that would be appreciated.

Auxiliary question: Is any big project using `use_custom_libcxx = false` (eg. 
Microsoft's C++ standard library), or is this untested? Chrome/node/deno all 
use libc++?

Best regards,
Jean-Claude

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