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powerpc64: Clear FSCR SPR, so that it's in a known state

Description

powerpc64: Clear FSCR SPR, so that it's in a known state

This now turns any access to the DSCR SPR into a SIGILL. Later commits will
make DCSR work correctly on POWER8 and POWER9.

PR: 237208

Details

Provenance
jhibbitsAuthored on
Parents
rS346729: powerpc: Fix whitespace in SPR header.
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