RFR: 8260327: Shenandoah: Shenandoah may fail with -XX:UseSSE=0 on x86_32

[Jie Fu]

Hi all,

I'd like to fix this bug although UseSSE=0 won't be used in product environments.
However, it will be benefit for our testing of OpenJDK.

The fix just following the style of RegisterSaver::save_live_registers [1].

Thanks.
Best regards,
Jie

[1] https://github.com/openjdk/jdk/blob/master/src/hotspot/cpu/x86/sharedRuntime_x86_32.cpp#L205

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Commit messages:
 - 8260327: Shenandoah: Shenandoah may fail with -XX:UseSSE=0 on x86_32

Changes: https://git.openjdk.java.net/jdk/pull/2214/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=2214&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8260327
  Stats: 48 lines in 2 files changed: 44 ins; 0 del; 4 mod
  Patch: https://git.openjdk.java.net/jdk/pull/2214.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/2214/head:pull/2214

PR: https://git.openjdk.java.net/jdk/pull/2214