[LLVM-C] Expose User::getOperandUse as LLVMGetOperandUse.

Patch by Gabriel Radanne <drupyog@zoho.com>

llvm-svn: 215419
diff --git a/llvm/include/llvm-c/Core.h b/llvm/include/llvm-c/Core.h
index 69ed08d..e5d5f3f 100644
--- a/llvm/include/llvm-c/Core.h
+++ b/llvm/include/llvm-c/Core.h
@@ -1378,6 +1378,13 @@
 LLVMValueRef LLVMGetOperand(LLVMValueRef Val, unsigned Index);
 
 /**
+ * Obtain the use of an operand at a specific index in a llvm::User value.
+ *
+ * @see llvm::User::getOperandUse()
+ */
+LLVMUseRef LLVMGetOperandUse(LLVMValueRef Val, unsigned Index);
+
+/**
  * Set an operand at a specific index in a llvm::User value.
  *
  * @see llvm::User::setOperand()