[X86] Adding test cases for LEA factorization (PR32755 / D35014)

Differential Revision: https://reviews.llvm.org/D35886

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@309262 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed