hg: panama/dev: Split conversion tests into separate test source files.

[paul.sandoz at oracle.com]

Changeset: 551285136221
Author:    epavlova
Date:      2020-04-22 15:24 -0700
URL:       https://hg.openjdk.java.net/panama/dev/rev/551285136221

Split conversion tests into separate test source files.

+ test/jdk/jdk/incubator/vector/AbstractVectorConversionTest.java
+ test/jdk/jdk/incubator/vector/Vector128ConversionTests.java
+ test/jdk/jdk/incubator/vector/Vector256ConversionTests.java
+ test/jdk/jdk/incubator/vector/Vector512ConversionTests.java
+ test/jdk/jdk/incubator/vector/Vector64ConversionTests.java
- test/jdk/jdk/incubator/vector/VectorConversionTests.java
+ test/jdk/jdk/incubator/vector/VectorMaxConversionTests.java