[SystemZ] Fix off-by-one error in backend (#200141) When combineCCMask is called on a TM node with two constant operands, and all of the bits in the mask are active, the existing APInt bit access goes off the overall length of the integer by one. This commit fixes that by using the index value of the leftmost active bit, rather than the number of active bits. (cherry picked from commit 78eca55b542b6bca573f34a1b359fa949c3a8c89)
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