Fix comment typo + spelling.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@219572
91177308-0d34-0410-b5e6-
96231b3b80d8
/// \brief Try to lower a vector shuffle as a byte rotation.
///
/// We have a generic PALIGNR instruction in x86 that will do an arbitrary
-/// byte-rotation of a the concatentation of two vectors. This routine will
+/// byte-rotation of the concatenation of two vectors. This routine will
/// try to generically lower a vector shuffle through such an instruction. It
/// does not check for the availability of PALIGNR-based lowerings, only the
/// applicability of this strategy to the given mask. This matches shuffle