Auto merge of #146444 - heiher:fix-loong-jemalloc-page-size, r=Mark-Simulacrum

bootstrap: Build jemalloc for LoongArch with support for 16K pages

By default, jemalloc is configured with a 4K page size. If the host’s page size is larger than this, it will crash at runtime. This patch raises the page size to 16K.

Author: bors