[linaro/gcc-4_8-branch] Backports from trunk and merge from gcc-4_8-branch

[Christophe Lyon]

We have committed several backports from trunk to linaro/gcc-4_8-branch:

r200956 as r203832 ([AArch64] -mcmodel=tiny -fPIC GOT support)
r204336 as r204569 (Fix testsuite testcase
            neon-vcond-[ltgt,unordered].c)
r203267, r203603 and r204247 as r204570 (Fix PR target/58423)
r197526: reverted as r204671 (Add negdi_extend patterns)

We have also merged the gcc-4_8-branch into linaro/gcc-4_8-branch up to
revision 204657 as r204811.

This was part of our 2013.11 release.

Christophe.