[LLDB] Add SBInstruction::GetControlFlowKind()

D128477 adds the control flow kind for `Instruction` and displays this
in the `thread trace dump instruction -k` command.

This diff exposes the control flow kind via the new
`SBInstruction::GetControlFlowKind` method.

I've expanded `TestDisassembleRawData` to test this method, but please
let me know if there are any other unittests that should also be updated.

Test Plan:
`./bin/lldb-dotest -p TestDisassembleRawData`

Differential Revision: https://reviews.llvm.org/D131005

lldb/test/API/python_api/disassemble-raw-data/TestDisassembleRawData.py

@@ -52,16 +52,26 @@ class DisassembleRawDataTestCase(TestBase):
             self.assertEqual(inst.GetMnemonic(target), "move")
             self.assertEqual(inst.GetOperands(target),
                             '$' + "fp, " + '$' + "sp")
+            self.assertEqual(inst.GetControlFlowKind(target),
+                            lldb.eInstructionControlFlowKindUnknown)
         elif re.match("powerpc64le", arch):
             self.assertEqual(inst.GetMnemonic(target), "li")
             self.assertEqual(inst.GetOperands(target), "4, 0")
+            self.assertEqual(inst.GetControlFlowKind(target),
+                            lldb.eInstructionControlFlowKindUnknown)
         elif arch in ("aarch64", "arm64"):
             self.assertEqual(inst.GetMnemonic(target), "mov")
             self.assertEqual(inst.GetOperands(target), "w0, #0x63")
+            self.assertEqual(inst.GetControlFlowKind(target),
+                            lldb.eInstructionControlFlowKindUnknown)
         elif arch == "arm":
             self.assertEqual(inst.GetMnemonic(target), "mov")
             self.assertEqual(inst.GetOperands(target), "r3, #99")
+            self.assertEqual(inst.GetControlFlowKind(target),
+                            lldb.eInstructionControlFlowKindUnknown)
         else:
             self.assertEqual(inst.GetMnemonic(target), "movq")
             self.assertEqual(inst.GetOperands(target),
                             '%' + "rsp, " + '%' + "rbp")
+            self.assertEqual(inst.GetControlFlowKind(target),
+                            lldb.eInstructionControlFlowKindOther)