Subzero: Enable errors for unused parameters.

src/IceConverter.cpp

Index: src/IceConverter.cpp
diff --git a/src/IceConverter.cpp b/src/IceConverter.cpp
index 0a885221ca6d02c435f9f76d1e88eb8faeef7cf2..e9533a336444d6f6c86ac14dc17f536379a143e4 100644
--- a/src/IceConverter.cpp
+++ b/src/IceConverter.cpp
@@ -24,6 +24,9 @@
 #include "IceTargetLowering.h"
 #include "IceTypes.h"
 #include "IceTypeConverter.h"
+
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wunused-parameter"
 #include "llvm/IR/Constant.h"
 #include "llvm/IR/Constants.h"
 #include "llvm/IR/DataLayout.h"
@@ -31,6 +34,7 @@
 #include "llvm/IR/Instructions.h"
 #include "llvm/IR/LLVMContext.h"
 #include "llvm/IR/Module.h"
+#pragma clang diagnostic pop
 
 
 // TODO(kschimpf): Remove two namespaces being visible at once.