[CMake] Give lldb tools functional install targets when building LLDB.framework
[CMake] Give lldb tools functional install targets when building LLDB.framework

Summary:
This change makes the install targets for lldb tools functional when
building for the framework.

I am currently working on the install rules for lldb-framework and this will
let me make `install-lldb-framework` rely on `install-lldb-argdumper` for
instance. This is especially important for `install-lldb-framework-stripped`. It
is much better for `install-lldb-framework-stripped` to rely on
`install-lldb-argdumper-stripped` than to copy and strip lldb-argdumper
manually.

Differential Revision: https://reviews.llvm.org/D49038

git-svn-id: 4c4cc70b1ef44ba2b7963015e681894188cea27e@337202 91177308-0d34-0410-b5e6-96231b3b80d8

apple/swift-lldb,apple/swift-lldb,llvm-mirror/lldb,llvm-mirror/lldb,apple/swift-lldb,llvm-mirror/lldb,apple/swift-lldb,apple/swift-lldb,llvm-mirror/lldb,llvm-mirror/lldb,apple/swift-lldb