A previous argument against link time optimization support that we have for gcc is that it was extremely slow. After some checks it turns out we are passing rather inefficient flags to gcc in optimized builds. Changing these flags to run the linker optimizations in parallel and passing additional flags to the compiler have the ability to speed this process up significantly. Also fixes some incorrect flags passed to ld for linking as well
------------- Commit messages: - JvmFeatures.gmk - autoconf Changes: https://git.openjdk.org/jdk/pull/13180/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=13180&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8304893 Stats: 8 lines in 2 files changed: 5 ins; 0 del; 3 mod Patch: https://git.openjdk.org/jdk/pull/13180.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/13180/head:pull/13180 PR: https://git.openjdk.org/jdk/pull/13180
