Revert r338354 "[ARM] Revert r337821"

Revert r338354 "[ARM] Revert r337821"

Disable ARMCodeGenPrepare by default again. It is causing verifier
failues in V8 that look like:

  Duplicate integer as switch case
  switch i32 %trunc, label %if.end13 [
    i32 0, label %cleanup36
    i32 0, label %if.then8
  ], !dbg !4981
  i32 0
  fatal error: error in backend: Broken function found, compilation aborted!

I will continue reducing the test case and send it along.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@338452 91177308-0d34-0410-b5e6-96231b3b80d8