RFR: 8320209: VectorMaskGen clobbers rflags on x86_64

[Jatin Bhateja]

On Wed, 15 Nov 2023 22:31:50 GMT, Sandhya Viswanathan <sviswanathan at openjdk.org> wrote:

> VectorMaskGen clobbers rflags on x86_64 but the corresponding instruct in x86.ad file doesn't list the rflags as being killed.
> Adding rFlagsReg cr as being killed in effects for vmask_gen instruct.

Marked as reviewed by jbhateja (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/16680#pullrequestreview-1733562973