[ORC] Add function to get pool entry string.

Patch by Andres Freund. Thanks Andres!

Author: lhames

llvm/include/llvm-c/Orc.h

@@ -319,6 +319,8 @@ void LLVMOrcRetainSymbolStringPoolEntry(LLVMOrcSymbolStringPoolEntryRef S);
  */
 void LLVMOrcReleaseSymbolStringPoolEntry(LLVMOrcSymbolStringPoolEntryRef S);
 
+const char *LLVMOrcSymbolStringPoolEntryStr(LLVMOrcSymbolStringPoolEntryRef S);
+
 /**
  * Reduces the ref-count of a ResourceTracker.
  */

llvm/lib/ExecutionEngine/Orc/OrcV2CBindings.cpp

@@ -188,6 +188,10 @@ void LLVMOrcReleaseSymbolStringPoolEntry(LLVMOrcSymbolStringPoolEntryRef S) {
   OrcV2CAPIHelper::releasePoolEntry(unwrap(S));
 }
 
+const char *LLVMOrcSymbolStringPoolEntryStr(LLVMOrcSymbolStringPoolEntryRef S) {
+  return unwrap(S)->getKey().data();
+}
+
 LLVMOrcResourceTrackerRef
 LLVMOrcJITDylibCreateResourceTracker(LLVMOrcJITDylibRef JD) {
   auto RT = unwrap(JD)->createResourceTracker();