[RFC][PR88838][SVE] Use 32-bit WHILELO in LP64 mode

[Kugan Vivekanandarajah]

Hi,

Attached RFC patch attempts to use 32-bit WHILELO in LP64 mode to fix
the PR. Bootstarp and regression testing ongoing. In earlier testing,
I ran into an issue related to fwprop. I will tackle that based on the
feedback for the patch.

Thanks,
Kugan
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