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This patch fixes the store.exp failures for ARM. Two changes: - Change char to signed char, because some patterns match -1. If anyone prefers changing the patterns to match 255 would work too.
- Change "return l" to "return l + r". "up; print r" doesn't work if "r" is not live across the function call; even without optimization GCC will re-use the register. Then we lose.
I believe these changes don't impact the point of the test. If nobody disagrees with me, I'd like to commit this.
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