[CUDA] Remove three obsolete CUDA cc1 flags.

[CUDA] Remove three obsolete CUDA cc1 flags.

Summary:
* -fcuda-target-overloads

  Previously unconditionally set to true by the driver.  Necessary for
  correct functioning of the compiler -- our CUDA headers wrapper won't
  compile without this.

* -fcuda-disable-target-call-checks

  Previously unconditionally set to true by the driver.  Necessary to
  compile almost any external CUDA code -- almost all libraries assume
  that host+device code can call host or device functions.

* -fcuda-allow-host-calls-from-host-device

  No effect when target overloading is enabled.

Reviewers: tra

Subscribers: rsmith, cfe-commits

Differential Revision: http://reviews.llvm.org/D18416

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@264739 91177308-0d34-0410-b5e6-96231b3b80d8