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[build][modules] Fix ObjCARCUtil.h modularization

Authored by kastiglione on Mar 8 2021, 3:42 PM.

Description

[build][modules] Fix ObjCARCUtil.h modularization

This change was introduced by this fix:
a2a55def354df2cd4de0b1cbd6b2795a07e6905a.

This makes a submodule for ObjCARCUtil.h, because leaving it in
LLVM_intrinsic_gen causes a dependency cycle between LLVM_IR and
LLVM_intrinsic_gen.