Revert "Introduce SymbolResolver and its subclasses."

This reverts commit ee69009f3590748aac4db17c0f9774252326d6cb.
diff --git a/lib/ExecutionEngine/Compiler.h b/lib/ExecutionEngine/Compiler.h
index b5872d6..8fee17c 100644
--- a/lib/ExecutionEngine/Compiler.h
+++ b/lib/ExecutionEngine/Compiler.h
@@ -139,6 +139,8 @@
 
     int runMCCodeGen(llvm::TargetData *TD, llvm::TargetMachine *TM);
 
+    static void *resolveSymbolAdapter(void *context, char const *name);
+
     int runInternalPasses(std::vector<std::string>& Names,
                           std::vector<uint32_t>& Signatures);