ARM: Fix __bss_start and __bss_end in linker scripts
Commit 3ebd1cbc introduced compiler-generated __bss_start and __bss_end__ and commit c23561e7 rewrote all __bss_end__ as __bss_end. Their merge caused silent and harmless but potentially bug-inducing clashes between compiler- and linker- generated __bss_end symbols. Make __bss_end and __bss_start compiler-only, and create __bss_base and __bss_limit for linker-only use. Signed-off-by: NAlbert ARIBAUD <albert.u.boot@aribaud.net> Reported-by: NBenoît Thébaudeau <benoit.thebaudeau@advansee.com>
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