RFR: 8359801: RISC-V: Simplify Interpreter::profile_taken_branch

[Anjian Wen]

Do the same thing as [JDK-8357434](https://bugs.openjdk.org/browse/JDK-8357434) [JDK-8358655](https://bugs.openjdk.org/browse/JDK-8358655) but for riscv

The Interpreter::profile_taken_branch has the same sbbptr pattern  with [JDK-8358105](https://bugs.openjdk.org/browse/JDK-8358105)，The counter is 64-bit, never practically overflows , and no other code cares about it. so we can remove the overflows check

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Commit messages:
 - RISC-V: Simplify Interpreter::profile_taken_branch

Changes: https://git.openjdk.org/jdk/pull/25848/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=25848&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8359801
  Stats: 16 lines in 3 files changed: 0 ins; 10 del; 6 mod
  Patch: https://git.openjdk.org/jdk/pull/25848.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25848/head:pull/25848

PR: https://git.openjdk.org/jdk/pull/25848