Fixing dependencies for native tablegen.

Fixing dependencies for native tablegen.

The dependencies for cross-built tablegen were a bit confused. This fixes that. The following dependencies are now enforced:

(1) Tablegen tasks depend on the native tablegen
(2) Native tablegen depends on the cross-compiled tablegen

Although the native tablegen doesn't actually require the cross tablegen, having this dependency forces the native tablegen to rebuild whenever the cross tablegen changes.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@232730 91177308-0d34-0410-b5e6-96231b3b80d8