Provide a hook to set the code generation debug options to investigate lto failures.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53119 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm-c/lto.h

@@ -227,6 +227,11 @@ extern const void*
 lto_codegen_compile(lto_code_gen_t cg, size_t* length);
 
 
+/**
+ * Sets options to help debug codegen bugs.
+ */
+extern void
+lto_codegen_debug_options(lto_code_gen_t cg, const char *);
 #ifdef __cplusplus
 }
 #endif