Fangrui Song 7899fe9da8 [X86] Reland D71360 Clean up UseInitArray initialization for X86ELFTargetObjectFile ...

UseInitArray is now the CC1 default but TargetLoweringObjectFileELF::UseInitArray still defaults to false.
The following two unknown OS target triples continue using .ctors/.dtors because InitializeELF is not called.

clang -target i386 -c a.c
clang -target x86_64 -c a.c

This cleanup fixes this as a bonus.

Differential Revision: https://reviews.llvm.org/D71360

2020-03-20 11:18:36 -07:00

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