Fix the run line and make this test more specific.

llvm-svn: 32403

llvm/test/Regression/Assembler/2006-12-09-Cast-To-Bool.ll

-; RUN llvm-upgrade < %s | llvm-as
+; RUN: llvm-upgrade < %s | llvm-as | llvm-dis | grep bitcast
 bool %main(int %X) {
   %res = cast bool true to bool
   ret bool %res