In breakpoint(), use a different immediate to make sure we can distinguish between debugger inserted breakpoints and fixed breakpoints. While here, make sure the break instruction never ends up in the last slot of a bundle by forcing it to be an M-unit instruction. This makes it easier for use to skip over it.
In breakpoint(), use a different immediate to make sure we can
distinguish between debugger inserted breakpoints and fixed
breakpoints. While here, make sure the break instruction never
ends up in the last slot of a bundle by forcing it to be an
M-unit instruction. This makes it easier for use to skip over
it.

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