RFR: 8366441: AArch64: Support WFET in OnSpinWait

[Andrew Haley]

On Mon, 1 Sep 2025 11:00:27 GMT, Ruben <duke at openjdk.org> wrote:

> The WFET and CNTVCTSS_EL0 read are added to aarch64-asmtest.py as hex values - using the instruction mnemonics would require support of -march=armv9-2.a, and consequently, the binutils 2.36+.

So please use binutils 2.36+.

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PR Comment: https://git.openjdk.org/jdk/pull/27030#issuecomment-3242604646