Add a test case for PR15318 fixed in r177472

llvm-svn: 177489
diff --git a/llvm/test/CodeGen/Generic/2013-03-20-APFloatCrash.ll b/llvm/test/CodeGen/Generic/2013-03-20-APFloatCrash.ll
new file mode 100644
index 0000000..a1aed0e
--- /dev/null
+++ b/llvm/test/CodeGen/Generic/2013-03-20-APFloatCrash.ll
@@ -0,0 +1,7 @@
+; RUN: llc < %s
+
+define internal i1 @f(float %s) {
+entry:
+  %c = fcmp ogt float %s, 0x41EFFFFFE0000000
+  ret i1 %c
+}