patch: fix memory leak of TargetMachine

[Nick Lewycky]

Presently EmitAssemblyHelper::EmitAssembly unconditionally leaks an
llvm::TargetMachine. This is quite unhelpful when using clang as a library.
The attached patch adds a codegen option for whether we permit leaking it,
and ties that to the same -disable-free flag that the frontend uses. Please
review!

Nick
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