RFR: 8308994: C2: Re-implement experimental post loop vectorization

[Pengfei Li]

On Fri, 23 Jun 2023 14:06:33 GMT, Emanuel Peter <epeter at openjdk.org> wrote:

> Tests are building...
> 
> I already am getting this, from our build system: `Toolchain: clang (clang/LLVM from Xcode 12.4)`, for the `macosx-aarch64-...` builds.
> 
> ```
> .../src/hotspot/share/opto/vmaskloop.cpp:970:20: error: format string is not a string literal [-Werror,-Wformat-nonliteral]
>     tty->vprint_cr(format, ap);
> ```
> 
> That means we won't get any test coverage on those platforms from this test run.

Build issues are fixed in commit 2 by removing the `va_list` which is not actually used in current code.

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PR Comment: https://git.openjdk.org/jdk/pull/14581#issuecomment-1617635167