RFR: 8297953: Fix several C2 IR matching tests for RISC-V

[Feilong Jiang]

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

Testing:
- test/hotspot/jtreg/compiler/c2/irTests/TestFPComparison.java -- no tests selected as expected.

- With `-XX:+UseZbb`:
  - test/hotspot/jtreg/compiler/c2/irTests/RotateLeftNodeIntIdealizationTests.java -- passed
  - test/hotspot/jtreg/compiler/c2/irTests/RotateLeftNodeLongIdealizationTests.java -- passed

- With `-XX:-UseZbb`:
  - test/hotspot/jtreg/compiler/c2/irTests/RotateLeftNodeIntIdealizationTests.java -- no tests selected as expected
  - test/hotspot/jtreg/compiler/c2/irTests/RotateLeftNodeLongIdealizationTests.java -- no tests selected as expected

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Commit messages:
 - fix some irtest failed on riscv

Changes: https://git.openjdk.org/jdk/pull/11453/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=11453&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8297953
  Stats: 4 lines in 4 files changed: 2 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/11453.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11453/head:pull/11453

PR: https://git.openjdk.org/jdk/pull/11453