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[PowerPC]: Don't allow r0 as a target for LD_GOT_TPREL_L/32
Summary: The linker is free to relax this (relocation R_PPC_GOT_TPREL16) against R_PPC_TLS, if it sees fit (initial exec to local exec). If r0 is used, this can generate execution-invalid code (converts to 'addi %rX, %r0, FOO, which translates in PPC-lingo to li %rX, FOO). Forbid this instead. This fixes static binaries using locales on FreeBSD/powerpc (tested on FreeBSD/powerpcspe). Reviewed By: nemanjai Differential Revision: https://reviews.llvm.org/D76662
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Justin Hibbits
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Mar 26, 2020
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