[AArch64][GlobalISel] Do no skip zext in getTestBitReg. (#177991) We can, when attempting to lower to tbz, skip a zext that is then not accounted for elsewhere. The attached test ends up with a tbz from an extract that then does not properly zext the value extracted from the vector. This patch fixes that by only looking through a G_ZEXT if the bit checked is in the low part of the value, lining up the code with the comment. Fixes #173895 (cherry picked from commit 0321f3eeee5cceddc2541046ee155863f5f59585)
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