Bug #21046: Backport: TLS fix for ARM64

• Status: Closed
• Assignee: -
• Target version: -
• Backport: 3.1: REQUIRED, 3.2: REQUIRED, 3.3: REQUIRED, 3.4: REQUIRED

[nobu (Nobuyoshi Nakada)]

f7059af50a31a4d27a04ace0beadb60616f3f971

Use no-inline version rb_current_ec on Arm64

The TLS across .so issue seems related to Arm64, but not Darwin.