[X86] Disable custom type legalization for v2i32/v4i16/v8i8->f64 bitcast.
[X86] Disable custom type legalization for v2i32/v4i16/v8i8->f64 bitcast.

The generic legalization handles this in the same way so just use
that.

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@368966 91177308-0d34-0410-b5e6-96231b3b80d8

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