Fix several IR matching tests that failed on RISC-V.

Rotate Node will be matched only when UseZbb is enabled:
- test/hotspot/jtreg/compiler/c2/irTests/RotateLeftNodeIntIdealizationTests.java
- test/hotspot/jtreg/compiler/c2/irTests/RotateLeftNodeLongIdealizationTests.java

RISC-V does not provide float branch instruction, so we do not match CMOVEI for two floating-point comparisons:
- test/hotspot/jtreg/compiler/c2/irTests/TestFPComparison.java