Change the API of bccPrepareRelocatable().

Remove the caching from this function. It makes the API simpler
and intuitive. OBJPATH in the prototype is the path of the output
relocatable object file.

Change-Id: I03c423661a5ad306e8a18e30c838770a00a37f55
diff --git a/lib/ExecutionEngine/Script.h b/lib/ExecutionEngine/Script.h
index 73a2ce1..070b717 100644
--- a/lib/ExecutionEngine/Script.h
+++ b/lib/ExecutionEngine/Script.h
@@ -188,8 +188,7 @@
                             char const *dsoPath,
                             unsigned long flags);
 
-    int prepareRelocatable(char const *cacheDir,
-                           char const *cacheName,
+    int prepareRelocatable(char const *objPath,
                            llvm::Reloc::Model RelocModel,
                            unsigned long flags);