Two IR matching tests added by https://bugs.openjdk.org/browse/JDK-8332268 are failing on RISC-V:
  TEST: compiler/c2/irTests/ModINodeIdealizationTests.java
  TEST: compiler/c2/irTests/ModLNodeIdealizationTests.java

These two tests require conditional move support. See ModLNode::Ideal & ModLNode::Ideal [1][2].
But RISC-V base ISA (RV64GCV) does not support conditional move, so we set `ConditionalMoveLimit`
to 0 for this CPU platform. This change simply skips these two tests for now.

Some further information:
An initial version of conditional move based on Zicond extension has been added by:
https://bugs.openjdk.org/browse/JDK-8344306. But that still lacks performance tunning and we will
review this `ConditionalMoveLimit` parameter as we go. See https://bugs.openjdk.org/browse/JDK-8346786.

[1] https://github.com/openjdk/jdk/blob/master/src/hotspot/share/opto/divnode.cpp#L993
[2] https://github.com/openjdk/jdk/blob/master/src/hotspot/share/opto/divnode.cpp#L1253