Added another test case for double FP constants as well.

llvm-svn: 15233
diff --git a/llvm/test/Regression/CodeGen/CBackend/2004-02-26-FPNotPrintableConstants.llx b/llvm/test/Regression/CodeGen/CBackend/2004-02-26-FPNotPrintableConstants.llx
index 6be7b71..36b19f3 100644
--- a/llvm/test/Regression/CodeGen/CBackend/2004-02-26-FPNotPrintableConstants.llx
+++ b/llvm/test/Regression/CodeGen/CBackend/2004-02-26-FPNotPrintableConstants.llx
@@ -5,3 +5,6 @@
   ret float 0xFFF0000000000000  ; -inf
 }
 
+double %func2() {
+  ret double 0xFF20000000000000  ; -inf
+}