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This seems to have succumbed to bit-rot -- there are new target-read functions
in target.c that don't pay any attention to this user-settable mode bit.
The purpose of "trust-readonly-sections" is to improve speed on targets where reading memory is expensive (mostly remote). It checks to see if a read is from a read-only section, and if so, reads it from the exec file. It defaults to "off" for safety, but if users choose to use it, it really speeds up prologue analysis (and therefore stepping).
This patch just makes it work again.
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trust_readonly
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