Add scalar lowering for sqrt intrinsic.

crosstest/test_fcmp_main.cpp

Index: crosstest/test_fcmp_main.cpp
diff --git a/crosstest/test_fcmp_main.cpp b/crosstest/test_fcmp_main.cpp
index 8677c48dfc7d753ef7ba2b41810cafd9a579de1e..0c98c0ada8ca3d3b344499f4c4a48bbc067f1a5d 100644
--- a/crosstest/test_fcmp_main.cpp
+++ b/crosstest/test_fcmp_main.cpp
@@ -22,15 +22,18 @@ int main(int argc, char **argv) {
   static const double Ten = 10.0;
   static const double PosInf = 1.0 / 0.0;
   static const double Nan = 0.0 / 0.0;
+  static const double NegNan = -0.0 / 0.0;
   assert(std::fpclassify(NegInf) == FP_INFINITE);
   assert(std::fpclassify(PosInf) == FP_INFINITE);
   assert(std::fpclassify(Nan) == FP_NAN);
+  assert(std::fpclassify(NegNan) == FP_NAN);
   assert(NegInf < Zero);
   assert(NegInf < PosInf);
   assert(Zero < PosInf);
 
-  volatile double Values[] = { NegInf,  Zero,    DBL_MIN, FLT_MIN, Ten,
-                               FLT_MAX, DBL_MAX, PosInf,  Nan, };
+  volatile double Values[] = { NegInf, -Zero,   Zero,    DBL_MIN, FLT_MIN,
+                               Ten,    FLT_MAX, DBL_MAX, PosInf,  Nan,
+                               NegNan };
   const static size_t NumValues = sizeof(Values) / sizeof(*Values);
 
   typedef bool (*FuncTypeFloat)(float, float);