[lldb-mi] Fix Windows build, missing assert.h include.
[lldb-mi] Fix Windows build, missing assert.h include.

Reviewers: ki.stfu, abidh

Subscribers: lldb-commits

Differential Revision: http://reviews.llvm.org/D11387

git-svn-id: 4c4cc70b1ef44ba2b7963015e681894188cea27e@242778 91177308-0d34-0410-b5e6-96231b3b80d8

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