RFR: 8263354: Accumulated C2 code cleanups

[Claes Redestad]

On Thu, 11 Mar 2021 08:48:18 GMT, Pengfei Li <pli at openjdk.org> wrote:

> This is a trivial patch to cleanup C2 code at several places, including
> 
> - Remove duplicated node enumerations of MinV & MaxV in adlc functions
> - Use "1<<X" to define LoopNode flags, like other C2 flag definitions
> - Unify macro names in aarch64_sve_ad.m4: UNPREDICATE -> UNPREDICATED
> - Delete redundant empty lines in aarch64_sve.ad
> 
> Tier1 tests passed.

src/hotspot/cpu/aarch64/aarch64_sve.ad line 2:

> 1: //
> 2: // Copyright (c) 2021, Oracle and/or its affiliates. All rights reserved.

Usually the year of introduction is preserved, so this should be `2020, 2021,`

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PR: https://git.openjdk.java.net/jdk/pull/2934