RFR: 8280867: Cpuid1Ecx feature parsing is incorrect for AMD CPUs

[Aleksey Shipilev]

See discussion in the bug. AFAICS, the fix is to "just" shift the flags by one to match both Intel and AMD specs. I believe this is not a serious bug, because adjacent bits in AMD case are set on modern chips, and Intel detection code only uses `lzcnt` and `prefetchw` out of these flags, both with Intel-specific hacks that are dropped now.

Additional testing:
 - [x] Linux x86_64 fastdebug on TR 3970X (Zen 2)
 - [x]  Linux x86_64 fastdebug on i5-11500 (Rocket Lake)
 - [x] Eyeballing `-Xlog:os+cpu` on TR 3970X (Zen 2) -- no change in detected flags
 - [x]  Eyeballing `-Xlog:os+cpu` on i5-11500 (Rocket Lake) -- no change in detected flags

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Commit messages:
 - ...and copyright dates.
 - Add braces, while we are at it
 - Fix

Changes: https://git.openjdk.java.net/jdk/pull/7287/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7287&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8280867
  Stats: 9 lines in 1 file changed: 0 ins; 1 del; 8 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7287.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7287/head:pull/7287

PR: https://git.openjdk.java.net/jdk/pull/7287