RFR: 8271078: jdk/incubator/vector/Float128VectorTests.java failed a subtest [v4]

[Dean Long]

> This test was failing because the safepoint polling stub was only saving the low 8 bytes of XMM16-XMM31.  We need to save all 16 bytes by default.  I also added "wide" to the boolean parameter name to better reflect what it controls.  And I made the asserts in save_live_registers() match what we have in restore_live_registers().

Dean Long has updated the pull request incrementally with one additional commit since the last revision:

  Just do full 512-bit memory accesses when -XX:+UseKNLSetting is set

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/8690/files
  - new: https://git.openjdk.java.net/jdk/pull/8690/files/a2bc8306..014035e2

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=8690&range=03
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=8690&range=02-03

  Stats: 4 lines in 1 file changed: 2 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/8690.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/8690/head:pull/8690

PR: https://git.openjdk.java.net/jdk/pull/8690