[riscv-port] RFR: 8277391: riscv: Remove the USE_LIBRARY_BASED_TLS_ONLY macro to use tls instead of pthread_getspecific [v3]

[zhengxiaolinX]

> Hi team,
> 
> This patch removes the USE_LIBRARY_BASED_TLS_ONLY macro to use tls instead of pthread_getspecific. [Original patch](https://github.com/riscv-collab/riscv-openjdk/pull/4)
> 
> Thanks,
> Xiaolin

zhengxiaolinX has refreshed the contents of this pull request, and previous commits have been removed. The incremental views will show differences compared to the previous content of the PR. The pull request contains one new commit since the last revision:

  Remove the USE_LIBRARY_BASED_TLS_ONLY macro to use tls instead of pthread_getspecific

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

Changes:
  - all: https://git.openjdk.java.net/riscv-port/pull/7/files
  - new: https://git.openjdk.java.net/riscv-port/pull/7/files/d64f27ef..9fa339c5

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=riscv-port&pr=7&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=riscv-port&pr=7&range=01-02

  Stats: 44 lines in 2 files changed: 0 ins; 42 del; 2 mod
  Patch: https://git.openjdk.java.net/riscv-port/pull/7.diff
  Fetch: git fetch https://git.openjdk.java.net/riscv-port pull/7/head:pull/7

PR: https://git.openjdk.java.net/riscv-port/pull/7