[X86] Change multiply by 26 to use two multiplies by 5 and an add instead of multiply by 3 and 9 and a subtract.

Same number of operations, but ending in an add is friendlier due to it being commutable.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@337869 91177308-0d34-0410-b5e6-96231b3b80d8
5 files changed