Change these tests to feed the assembly files to opt directly, instead
of using llvm-as, now that opt supports this.

llvm-svn: 81226
diff --git a/llvm/test/Transforms/SimplifyLibCalls/IsDigit.ll b/llvm/test/Transforms/SimplifyLibCalls/IsDigit.ll
index a290e01..869a371 100644
--- a/llvm/test/Transforms/SimplifyLibCalls/IsDigit.ll
+++ b/llvm/test/Transforms/SimplifyLibCalls/IsDigit.ll
@@ -1,5 +1,5 @@
 ; Test that the IsDigitOptimizer works correctly
-; RUN: llvm-as < %s | opt -simplify-libcalls | llvm-dis | \
+; RUN: opt %s -simplify-libcalls | llvm-dis | \
 ; RUN:   not grep call
 
 declare i32 @isdigit(i32)