Hello,

# [GNU-767] Support changing SVE vector length in remote debugging

* Analysed and fixed a couple more regressions in my branch. The change to per-thread target descriptions in gdbserver (which was the more challenging part) is now free of regressions. Now cleaning up the part that actually deals with the SVE vector length change.

# Linaro CI's GDB testsuite results

* Increased ccache's max size on most build bots. Sent email to the linaro-toolchain list summarising the current status of their ccache setup.

* Started looking more closely into how ccache configuration is put together in our container scripts to document it on the wiki (together with the steps I took to change the ccache max size).