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Handle using a sub instruction in the arm64 fbt

Description

Handle using a sub instruction in the arm64 fbt

Some stack frames are too large for a store pair instruction we already
detect in the arm64 fbt code. Add support for handling subtracting the
stack pointer directly.

Sponsored by: Innovate UK

Details

Provenance
andrewAuthored on Jan 12 2021, 12:14 PM
Parents
R10:d0df1a2d54dc: Only allow a store through sp in the arm64 fbt
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