[MCJIT] Start Stringref-izing the ExecutionEngine interface.

More methods to follow.

Using StringRef allows us the EE interface to work with more string types
without forcing construction of std::strings.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@217794 91177308-0d34-0410-b5e6-96231b3b80d8

lib/ExecutionEngine/Interpreter/Interpreter.h

@@ -116,7 +116,7 @@ public:
   GenericValue runFunction(Function *F,
                            const std::vector<GenericValue> &ArgValues) override;
 
-  void *getPointerToNamedFunction(const std::string &Name,
+  void *getPointerToNamedFunction(StringRef Name,
                                   bool AbortOnFailure = true) override {
     // FIXME: not implemented.
     return nullptr;

lib/ExecutionEngine/MCJIT/MCJIT.cpp

@@ -517,8 +517,7 @@ GenericValue MCJIT::runFunction(Function *F,
   llvm_unreachable("Full-featured argument passing not supported yet!");
 }
 
-void *MCJIT::getPointerToNamedFunction(const std::string &Name,
-                                       bool AbortOnFailure) {
+void *MCJIT::getPointerToNamedFunction(StringRef Name, bool AbortOnFailure) {
   if (!isSymbolSearchingDisabled()) {
     void *ptr = MemMgr.getPointerToNamedFunction(Name, false);
     if (ptr)

lib/ExecutionEngine/MCJIT/MCJIT.h

@@ -293,7 +293,7 @@ public:
   /// found, this function silently returns a null pointer. Otherwise,
   /// it prints a message to stderr and aborts.
   ///
-  void *getPointerToNamedFunction(const std::string &Name,
+  void *getPointerToNamedFunction(StringRef Name,
                                   bool AbortOnFailure = true) override;
 
   /// mapSectionAddress - map a section to its target address space value.