RFR: 8256267: Relax compiler/floatingpoint/NaNTest.java for x86_32 and lower -XX:+UseSSE [v4]

[Aleksey Shipilev]

> Reproduces like this:
> 
> $ CONF=linux-x86-server-fastdebug make images run-test TEST=compiler/floatingpoint/NaNTest.java TEST_VM_OPTS="-XX:UseSSE=1"
> 
> STDOUT:
> ### NanTest started
> Written and read back float values match
> 0x7F800001 0x7F800001
> STDERR:
> java.lang.RuntimeException: Original and read back double values mismatch
> 0xFFF0000000000001 0xFFF8000000000001
> 
> at compiler.floatingpoint.NaNTest.testDouble(NaNTest.java:56)
> at compiler.floatingpoint.NaNTest.main(NaNTest.java:69)
> 
> After reading through [JDK-8076373](https://bugs.openjdk.java.net/browse/JDK-8076373), I think the test cannot be expected to pass without SSE >= 2 for doubles, and SSE >= 1 for floats on x86_32. This change adds the platform and UseSSE sensing to test.
> 
> Additional testing:
>  - [x] Affected test on Linux x86_32 with `-XX:UseSSE={0,1,2}`
>  - [x] Affected test on Linux x86_64 with `-XX:UseSSE={0,1,2}`
>  - [x] Affected test on Linux AArch64

Aleksey Shipilev has updated the pull request incrementally with one additional commit since the last revision:

  Use SkippedException, print skipped steps

-------------

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/1187/files
  - new: https://git.openjdk.java.net/jdk/pull/1187/files/4e0350f2..13cd68fd

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=1187&range=03
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=1187&range=02-03

  Stats: 11 lines in 1 file changed: 8 ins; 2 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1187.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1187/head:pull/1187

PR: https://git.openjdk.java.net/jdk/pull/1187