LLVM 15 Rebase#93

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mem-frob wants to merge 5 commits intomasterfrom

pr-llvm15-rebase

Commits on Nov 2, 2022

Update submodules for LLVM15 rebase PR.
memfrob
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Commits on Nov 4, 2022

Bump FreeRTOS submodule again.
memfrob
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Bump freedom-e-sdk submodule.
memfrob
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Commits on Nov 24, 2022

Bump tools submodule to fix Makefiles.
memfrob
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Commits on Nov 29, 2022

Bump FreeRTOS submodule.
memfrob
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