Rename isString -> isExternalSymbol; getString -> getExternalSymbol since these work on externsym machine relocations.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@58895 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/ExecutionEngine/JIT/JITEmitter.cpp b/lib/ExecutionEngine/JIT/JITEmitter.cpp
index ce3df8a..9062cee 100644
--- a/lib/ExecutionEngine/JIT/JITEmitter.cpp
+++ b/lib/ExecutionEngine/JIT/JITEmitter.cpp
@@ -885,9 +885,9 @@
       MachineRelocation &MR = Relocations[i];
       void *ResultPtr = 0;
       if (!MR.letTargetResolve()) {
-        if (MR.isString()) {
-          ResultPtr = TheJIT->getPointerToNamedFunction(MR.getString());
-          DOUT << "JIT: Map \'" << MR.getString() << "\' to ["
+        if (MR.isExternalSymbol()) {
+          ResultPtr = TheJIT->getPointerToNamedFunction(MR.getExternalSymbol());
+          DOUT << "JIT: Map \'" << MR.getExternalSymbol() << "\' to ["
                << ResultPtr << "]\n";  
 
           // If the target REALLY wants a stub for this function, emit it now.