81013cfae7
Fix some execution bugs in the dtrace powerpc asm. addme pulls in the carry flag which we don't want, and the result wasn't recorded anyways, so the following beq to check for exit condition wasn't checking the right condition. Simplify the stack walking in dtrace_isa.c, so there's only a single walker that handles both pc and sp. This should make it easier to follow, and any bugfix that may be needed for walking only needs to be made in one place instead of two now. MFC after: 2 weeks
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