perf: change flags, add optimizations

Dockerfile.openj9

@@ -27,11 +27,13 @@ RUN git clone --single-branch --depth 1 \
 WORKDIR /build/src
 RUN bash get_source.sh
 
+ENV CC=/usr/bin/gcc CXX=/usr/bin/g++ \
+  CFLAGS="-O3 -flto -fuse-linker-plugin" \
+  LDFLAGS="-Wl,-O1"
 RUN bash configure \
-  --enable-libffi-bundling --enable-ddr --enable-jitserver \
-  --enable-fallback-linker --with-jtreg=/build/jtreg --with-boot-jdk=/build/bootjdk \
-  --with-openssl=system --with-extra-ldflags="-Wl,-z,noexecstack"
-
+  --with-boot-jdk=/build/bootjdk \
+  --with-openssl=system \
+  --enable-jvm-feature-link-time-opt
 RUN make all JOBS=$(nproc)
 
 # jlink by advice from https://adoptium.net/blog/2021/10/jlink-to-produce-own-runtime/