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b77dbefe72
In s390_irgen_EXRL, the offset is zero-extended instead of sign-extended, typically causing Valgrind to crash when a negative offset occurs. Fix this with a new helper function that calculates a "relative long" address from a 32-bit offset. Replace other calculations of "relative long" addresses by invocations of this function as well. And for consistency, do the same with "relative" (short) addresses.