RFR: JDK-8268461: ARM32: vector intrinsics reaches ShouldNotReachHere

[Christoph Göttschkes]

This fixes C2 vector intrinsics for 32-bit ARM.
Since the problem exists in mainline, I guess it should be fixed here first and will later be merged into the panama repository.

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Commit messages:
 - Remove superfluous whitespace.
 - Check vector_size_supported in match_rule_supported_vector, like on other platforms.

Changes: https://git.openjdk.java.net/jdk/pull/4430/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=4430&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8268461
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/4430.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/4430/head:pull/4430

PR: https://git.openjdk.java.net/jdk/pull/4430