RFR: 8353665: RISC-V: IR verification fails in TestSubNodeFloatDoubleNegation.java [v2]

[Hamlin Li]

> Hi,
> Can you help to review this patch?
> The newly added TestSubNodeFloatDoubleNegation.java (in https://github.com/openjdk/jdk/pull/24150) is to check `0 - (0 - x)` is not folded to `x` for float and double.
> I have manually checked the IR and generated assembly code, it's not folded on riscv either, just there is an extra SubF in some code path.
> So, the fix for this test on riscv should be simply make the check as `>= 2` rather than `2`.
> 
> Tested on both x86 and riscv64.
> 
> Thanks

Hamlin Li has updated the pull request incrementally with one additional commit since the last revision:

  refine

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/24421/files
  - new: https://git.openjdk.org/jdk/pull/24421/files/cd9df312..abb3d548

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=24421&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=24421&range=00-01

  Stats: 10 lines in 2 files changed: 6 ins; 2 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/24421.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/24421/head:pull/24421

PR: https://git.openjdk.org/jdk/pull/24421