Rename onload to llvm_plugin_onload in the LLVM gold plugin

llvm/tools/gold/gold-plugin.cpp

Index: llvm/tools/gold/gold-plugin.cpp
===================================================================
--- a/llvm/tools/gold/gold-plugin.cpp
+++ b/llvm/tools/gold/gold-plugin.cpp
@@ -152,8 +152,8 @@
 static ld_plugin_status all_symbols_read_hook(void);
 static ld_plugin_status cleanup_hook(void);
 
-extern "C" ld_plugin_status onload(ld_plugin_tv *tv);
-ld_plugin_status onload(ld_plugin_tv *tv) {
+extern "C" ld_plugin_status llvm_plugin_onload(ld_plugin_tv *tv); // @LOCALMOD
+ld_plugin_status llvm_plugin_onload(ld_plugin_tv *tv) { // @LOCALMOD
   // We're given a pointer to the first transfer vector. We read through them
   // until we find one where tv_tag == LDPT_NULL. The REGISTER_* tagged values
   // contain pointers to functions that we need to call to register our own