Change CreateTarget and dependents to accept StringRef.

llvm-svn: 287376
diff --git a/lldb/source/Commands/CommandObjectTarget.cpp b/lldb/source/Commands/CommandObjectTarget.cpp
index d36adb4..d2e53aa 100644
--- a/lldb/source/Commands/CommandObjectTarget.cpp
+++ b/lldb/source/Commands/CommandObjectTarget.cpp
@@ -278,7 +278,7 @@
       Debugger &debugger = m_interpreter.GetDebugger();
 
       TargetSP target_sp;
-      const char *arch_cstr = m_arch_option.GetArchitectureName();
+      llvm::StringRef arch_cstr = m_arch_option.GetArchitectureName();
       const bool get_dependent_files =
           m_add_dependents.GetOptionValue().GetCurrentValue();
       Error error(debugger.GetTargetList().CreateTarget(