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unknown user pushed a change to branch master in repository gcc.

from 85cff6e46d2 RISC-V: Take Xmode instead of Pmode for ussub expanding new 92208369313 AVR: Propose to use attribute signal(n) via AVR-LibC's ISR_N.

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Summary of changes: gcc/doc/extend.texi | 30 +++++++++++++++++++++++------- 1 file changed, 23 insertions(+), 7 deletions(-)