Rollup merge of #70527 - Amanieu:fix_fastisel, r=Mark-Simulacrum
Rollup merge of #70527 - Amanieu:fix_fastisel, r=Mark-Simulacrum

Update LLVM submodule

Fixes #70148

graydon/rust,aidancully/rust,graydon/rust,graydon/rust,aidancully/rust,aidancully/rust,aidancully/rust,graydon/rust,graydon/rust,aidancully/rust,aidancully/rust,graydon/rust