[turbofan] Add operators for float32 support.

src/compiler/graph-unittest.cc

Index: src/compiler/graph-unittest.cc
diff --git a/src/compiler/graph-unittest.cc b/src/compiler/graph-unittest.cc
index f7faa6de29da447790f61dda238ffb0b688a1e8d..8de6224e03a9295f5cc9acc86e0500380f0d43b9 100644
--- a/src/compiler/graph-unittest.cc
+++ b/src/compiler/graph-unittest.cc
@@ -664,6 +664,12 @@ Matcher<Node*> IsInt64Constant(const Matcher<int64_t>& value_matcher) {
 }
 
 
+Matcher<Node*> IsFloat32Constant(const Matcher<float>& value_matcher) {
+  return MakeMatcher(
+      new IsConstantMatcher<float>(IrOpcode::kFloat32Constant, value_matcher));
+}
+
+
 Matcher<Node*> IsFloat64Constant(const Matcher<double>& value_matcher) {
   return MakeMatcher(
       new IsConstantMatcher<double>(IrOpcode::kFloat64Constant, value_matcher));