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Revert 393dacacf7e7 "[ARM] Enable TypePromotion by default"

Authored by hans on Dec 9 2019, 12:39 AM.

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Revert 393dacacf7e7 "[ARM] Enable TypePromotion by default"

This caused "Too many bits for uint64_t" asserts when building Chromium. See
https://crbug.com/1031978#c2 for a reproducer. I'll follow up on the
llvm-commits thread with a creduced version.

ARMCodeGenPrepare has already been generalized and renamed to
TypePromotion. We've had it enabled and tested downstream for a
while, so enable it by default.

Differential Revision: https://reviews.llvm.org/D70998

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