[ELF] Refine isExported/isPreemptible condition Commit f10441ad003236ef3b9e5415a571d2be0c0ce5ce dropped a special case for isUndefWeak and --no-dynamic-linking but also made --export-dynamic ineffective for static PIE. This change restores the --export-dynamic behavior and entirely drops special handling of --no-dynamic-linker: * -pie with no input DSO, similar to --no-dynamic-linker, suppresses undefined symbols in .dynsym The new behaviors resemble GNU ld more.
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