Close difference gap on Cortex-A9, which resulted in further improvement
even on other processors.
Reviewed-by: NRichard Levitte <levitte@openssl.org>

As some of ARM processors, more specifically Cortex-Mx series, are
Thumb2-only, we need to support Thumb2-only builds even in assembly.
Reviewed-by: NTim Hudson <tjh@openssl.org>

Reviewed-by: NMatt Caswell <matt@openssl.org>
Reviewed-by: NRichard Levitte <levitte@openssl.org>

This facilitates "universal" builds, ones that target multiple
architectures, e.g. ARMv5 through ARMv7. See commentary in
Configure for details.
Reviewed-by: NArd Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: NMatt Caswell <matt@openssl.org>

Pointer out and suggested by: Ard Biesheuvel.

(more for longer keys) on RSA/DSA.

I can't think of any other cause for failure

developers responsible for -march choice.

is fixed now.

accordingly.