[llvm-c] Add LLVMPrintModuleToString.

Like LLVMDumpModule but returns the string (that needs to be freed
with LLVMDisposeMessage) instead of printing it to stderr.

Differential Revision: http://llvm-reviews.chandlerc.com/D1941



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@192821 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm-c/Core.h

@@ -540,6 +540,14 @@ void LLVMDumpModule(LLVMModuleRef M);
 LLVMBool LLVMPrintModuleToFile(LLVMModuleRef M, const char *Filename,
                                char **ErrorMessage);
 
+/**
+ * Return a string representation of the module. Use
+ * LLVMDisposeMessage to free the string.
+ *
+ * @see Module::print()
+ */
+char *LLVMPrintModuleToString(LLVMModuleRef M);
+
 /**
  * Set inline assembly for a module.
  *