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On PowerPC most functions require a valid TOC pointer. This is the case because either the function itself needs to use this pointer to access the TOC or because other functions that are called from that function expect a valid TOC pointer in the register R2. The main exception to this is leaf functions that do not access the TOC since they are guaranteed not to need a valid TOC pointer. This patch introduces a feature that will allow more functions to not require a valid TOC pointer in R2. Differential Revision: https://reviews.llvm.org/D73664
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