[ARM][testsuite] neon-testgen.ml removal

[Christophe Lyon <christophe dot lyon at linaro dot org>]

Hi,

This is a new attempt at removing neon-testgen.ml and generated files.

Compared to my previous version several months ago:
- I have recently added testcases to make sure we do not lose coverage
as described in
https://gcc.gnu.org/ml/gcc-patches/2015-11/msg02922.html
- I now also remove neon.ml as requested by Kyrylo in
https://gcc.gnu.org/ml/gcc-patches/2015-11/msg01664.html, and moved
the remaining hand-written tests up to gcc.target/arm.

Doing this, I had to slightly update vst1Q_laneu64-1.c because it's
now compiled with more pedantic flags and there was a signed/unsigned
char buffer pointer mismatch.

Sorry, I had to compress the patch, otherwise it's too large and rejected
by the list server.

OK?

Christophe

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