Index: llvm/trunk/lib/Target/AMDGPU/R600ISelLowering.cpp
===================================================================
--- llvm/trunk/lib/Target/AMDGPU/R600ISelLowering.cpp
+++ llvm/trunk/lib/Target/AMDGPU/R600ISelLowering.cpp
@@ -1714,6 +1714,12 @@
 
     if (NewBldVec[i].isUndef())
       continue;
+    // Fix spurious warning with gcc 7.3 -O3
+    //    warning: array subscript is above array bounds [-Warray-bounds]
+    //    if (NewBldVec[i] == NewBldVec[j]) {
+    //        ~~~~~~~~~~~^
+    if (i >= 4)
+      continue;
     for (unsigned j = 0; j < i; j++) {
       if (NewBldVec[i] == NewBldVec[j]) {
         NewBldVec[i] = DAG.getUNDEF(NewBldVec[i].getValueType());
Index: llvm/trunk/unittests/IR/ConstantRangeTest.cpp
===================================================================
--- llvm/trunk/unittests/IR/ConstantRangeTest.cpp
+++ llvm/trunk/unittests/IR/ConstantRangeTest.cpp
@@ -459,6 +459,7 @@
           }
         }
 
+        (void)HaveInterrupt3;
         assert(!HaveInterrupt3 && "Should have at most three ranges");
 
         ConstantRange SmallestCR = OpFn(CR1, CR2, ConstantRange::Smallest);
Index: llvm/trunk/unittests/Support/TypeTraitsTest.cpp
===================================================================
--- llvm/trunk/unittests/Support/TypeTraitsTest.cpp
+++ llvm/trunk/unittests/Support/TypeTraitsTest.cpp
@@ -7,6 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 #include "llvm/Support/type_traits.h"
+#include "gtest/gtest.h"
 
 namespace {
 
@@ -71,6 +72,26 @@
 template void TrivialityTester<A &&, false, true>();
 template void TrivialityTester<B &&, false, true>();
 
+TEST(Triviality, Tester) {
+  TrivialityTester<int, true, true>();
+  TrivialityTester<void *, true, true>();
+  TrivialityTester<int &, true, true>();
+  TrivialityTester<int &&, false, true>();
+
+  TrivialityTester<X, true, true>();
+  TrivialityTester<Y, false, false>();
+  TrivialityTester<Z, false, false>();
+  TrivialityTester<A, true, false>();
+  TrivialityTester<B, false, true>();
+
+  TrivialityTester<Z &, true, true>();
+  TrivialityTester<A &, true, true>();
+  TrivialityTester<B &, true, true>();
+  TrivialityTester<Z &&, false, true>();
+  TrivialityTester<A &&, false, true>();
+  TrivialityTester<B &&, false, true>();
+}
+
 } // namespace triviality
 
 } // end anonymous namespace
Index: llvm/trunk/unittests/Transforms/Scalar/CMakeLists.txt
===================================================================
--- llvm/trunk/unittests/Transforms/Scalar/CMakeLists.txt
+++ llvm/trunk/unittests/Transforms/Scalar/CMakeLists.txt
@@ -10,3 +10,8 @@
 add_llvm_unittest(ScalarTests
   LoopPassManagerTest.cpp
   )
+
+# Workaround for the gcc 6.1 bug https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80916.
+if (CMAKE_COMPILER_IS_GNUCXX AND CMAKE_CXX_COMPILER_VERSION VERSION_GREATER 6.0 AND CMAKE_CXX_COMPILER_VERSION VERSION_LESS 9.0)
+  set_source_files_properties(LoopPassManagerTest.cpp PROPERTIES COMPILE_FLAGS -Wno-unused-function)
+endif()
Index: llvm/trunk/unittests/Transforms/Scalar/LoopPassManagerTest.cpp
===================================================================
--- llvm/trunk/unittests/Transforms/Scalar/LoopPassManagerTest.cpp
+++ llvm/trunk/unittests/Transforms/Scalar/LoopPassManagerTest.cpp
@@ -20,19 +20,9 @@
 #include "llvm/IR/PassManager.h"
 #include "llvm/Support/SourceMgr.h"
 
-// Workaround for the gcc 6.1 bug PR80916.
-#if defined(__GNUC__) && __GNUC__ > 5
-#  pragma GCC diagnostic push
-#  pragma GCC diagnostic ignored "-Wunused-function"
-#endif
-
 #include "gmock/gmock.h"
 #include "gtest/gtest.h"
 
-#if defined(__GNUC__) && __GNUC__ > 5
-#  pragma GCC diagnostic pop
-#endif
-
 using namespace llvm;
 
 namespace {