[X86] Remove memory instructions form isUseDefConvertible.
[X86] Remove memory instructions form isUseDefConvertible.

The caller of this is looking for comparisons of the input
to these instructions with 0. But the memory instructions
input is an addess not a value input in a register.

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@363907 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/llvm,llvm-mirror/llvm,GPUOpen-Drivers/llvm,llvm-mirror/llvm,GPUOpen-Drivers/llvm,GPUOpen-Drivers/llvm,llvm-mirror/llvm,GPUOpen-Drivers/llvm,GPUOpen-Drivers/llvm,llvm-mirror/llvm,llvm-mirror/llvm,GPUOpen-Drivers/llvm,GPUOpen-Drivers/llvm,llvm-mirror/llvm,llvm-mirror/llvm,GPUOpen-Drivers/llvm,llvm-mirror/llvm