Auto merge of #153427 - heiher:loong64-linux-relax, r=jieyouxu

Enable link relaxation feature for LoongArch Linux targets

This patch series enables the link relaxation feature for LoongArch Linux targets. Link relaxation is a link-time optimization that helps improve the quality and efficiency of the final binary. To support this, the corss-toolchain has also been bumped to handle more types of link relaxation.

Author: bors