[PATCH] D105176: [InstrProfiling] Use external weak reference for bias variable

[Fangrui Song via Phabricator via llvm-commits]

MaskRay added a comment.

In D105176#2855238 <https://reviews.llvm.org/D105176#2855238>, @thakis wrote:

> (I believe @MaskRay did a lot of cool work in this general area recently, maybe he knows how to make this work.)

This is the normal problem that ld64 disallows undefined symbols by default, even in dylib mode.

This needs a dynamic lookup symbol, i.e. `-Wl,-U,__llvm_profile_counter_bias`


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