Fix unused parameters and variables

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@290459 91177308-0d34-0410-b5e6-96231b3b80d8

test/libcxx/numerics/c.math/constexpr-fns.pass.cpp

@@ -23,11 +23,10 @@
 
 #include <cmath>
 
-constexpr bool a = std::__libcpp_isnan(0.);
-constexpr bool b = std::__libcpp_isinf(0.0);
-constexpr bool c = std::__libcpp_isfinite(0.0);
+static_assert(std::__libcpp_isnan(0.) == false, "");
+static_assert(std::__libcpp_isinf(0.0) == false, "");
+static_assert(std::__libcpp_isfinite(0.0) == true, "");
 
 int main()
 {
-  return 0;
 }

test/libcxx/numerics/c.math/ctgmath.pass.cpp

@@ -18,5 +18,7 @@
 int main()
 {
     std::complex<double> cd;
+    ((void)cd);
     double x = std::sin(0);
+    ((void)x);
 }