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+++ This bug was initially created as a clone of Bug #1527903 +++

Bug 1527887 shows that PTHREAD_STACK_MIN is really low on x86-64 and cannot accomodate both a signal handler frame, the libgcc unwinder, and an ld.so trampoline on AVX-512 (where the XSAVE area is around 2.5 KiB, and it is needed twice).

We can immediately free around 2.5 KiB if we link libgcc with BIND_NOW, so that no trampoline is needed at run time.  Linking libgcc with BIND_NOW is desirable hardening, too.