Add PIE support for Xtensa

[Bob Wilson]

I've committed this patch to add PIE support for Xtensa.  Better late than never.

bfd/
	* elf32-xtensa.c (elf_xtensa_size_dynamic_sections): Add DT_DEBUG
	for PIE executables.

ld/
	* emulparams/elf32xtensa.sh (GENERATE_PIE_SCRIPT): Enable.

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