Auto merge of #145667 - weihanglo:target-cpu, r=<try>

[DO NOT MERGE] target-cpu=x86_64v3

try-job: dist-x86_64-linux

Author: rust-bors[bot]

src/ci/docker/host-x86_64/dist-x86_64-linux/Dockerfile

@@ -80,6 +80,8 @@ ENV PGO_HOST=x86_64-unknown-linux-gnu
 
 ENV HOSTS=x86_64-unknown-linux-gnu
 
+ENV RUSTFLAGS="-C target_cpu=x86-64-v3"
+
 ENV RUST_CONFIGURE_ARGS \
       --enable-full-tools \
       --enable-sanitizers \
@@ -90,6 +92,8 @@ ENV RUST_CONFIGURE_ARGS \
       --set target.x86_64-unknown-linux-gnu.ranlib=/rustroot/bin/llvm-ranlib \
       --set llvm.thin-lto=true \
       --set llvm.ninja=false \
+      --set llvm.cxxflags=-march=x86-64-v3 \
+      --set llvm.cflags=-march=x86-64-v3 \
       --set llvm.libzstd=true \
       --set rust.jemalloc \
       --set rust.use-lld=true \