a907008bcb
A few tests generate a statically-linked position-independent executable with `-nostdlib -Wl,--unresolved-symbols=ignore-all -pie` (`%clang`) and test PLT handling. (--unresolved-symbols=ignore-all suppresses undefined symbol errors and serves as a convenience hack.) This relies on an unguaranteed linker behavior: a statically-linked PIE does not necessarily generate PLT entries. While current lld generates a PLT entry, it will change to suppress the PLT entry to simplify internal handling and improve consistency. (The behavior has no consistency in GNU ld, some ports generated a .dynsym entry while some don't. While most seem to generate a PLT entry but some ports use a weird `R_*_NONE` relocation.)
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