Put TargetIsa's emit_inst under a "testing_hooks" feature. (#531)

* Put TargetIsa's emit_inst under a "testing_hooks" feature.

In practice, TargetIsa's emit_inst pulls in its own instantiation
of the target-specifi `emit_inst` functions, which can be quite
large, and LTO doesn't eliminate them because they're held live
by TargetIsa's vtable.

Fortunately, this function is only used by tests, so we can put
it behind a feature flag.

Fixes #530.

* Add comments for `emit_inst` to clarify its purpose.

lib/codegen/src/isa/arm64/mod.rs

@@ -7,7 +7,9 @@ mod registers;
 pub mod settings;
 
 use super::super::settings as shared_settings;
-use binemit::{emit_function, CodeSink, MemoryCodeSink};
+#[cfg(feature = "testing_hooks")]
+use binemit::CodeSink;
+use binemit::{emit_function, MemoryCodeSink};
 use ir;
 use isa::enc_tables::{lookup_enclist, Encodings};
 use isa::Builder as IsaBuilder;
@@ -98,6 +100,7 @@ impl TargetIsa for Isa {
         abi::allocatable_registers(func)
     }
 
+    #[cfg(feature = "testing_hooks")]
     fn emit_inst(
         &self,
         func: &ir::Function,