[riscv-port] RFR: 8279914: riscv：Wrong result caused by incorrect use of iregL2I operand in some c2 match rules [v2]

[Feilong Jiang]

> This PR fix the issue that incorrect use if iRegL2I operand in some c2 match rules.

Feilong Jiang has updated the pull request incrementally with one additional commit since the last revision:

  update commments rs2 to src2

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

Changes:
  - all: https://git.openjdk.java.net/riscv-port/pull/44/files
  - new: https://git.openjdk.java.net/riscv-port/pull/44/files/9ed5f2d8..7fe8898f

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=riscv-port&pr=44&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=riscv-port&pr=44&range=00-01

  Stats: 6 lines in 1 file changed: 0 ins; 0 del; 6 mod
  Patch: https://git.openjdk.java.net/riscv-port/pull/44.diff
  Fetch: git fetch https://git.openjdk.java.net/riscv-port pull/44/head:pull/44

PR: https://git.openjdk.java.net/riscv-port/pull/44