Update the prompt related functions to use StringRefs.

llvm-svn: 282269
diff --git a/lldb/source/Core/Event.cpp b/lldb/source/Core/Event.cpp
index cb753a9..85da9b8 100644
--- a/lldb/source/Core/Event.cpp
+++ b/lldb/source/Core/Event.cpp
@@ -113,6 +113,10 @@
   SetBytesFromCString(cstr);
 }
 
+EventDataBytes::EventDataBytes(llvm::StringRef str) : m_bytes() {
+  SetBytes(str.data(), str.size());
+}
+
 EventDataBytes::EventDataBytes(const void *src, size_t src_len) : m_bytes() {
   SetBytes(src, src_len);
 }