Add a GVN pass, using the value numbering code I developed for GVNPRE and the

load elimination code from RedundantLoadElimination.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@40469 91177308-0d34-0410-b5e6-96231b3b80d8

test/Transforms/GVN/basic.ll

@@ -0,0 +1,10 @@
+; RUN: llvm-as < %s | opt -gvn | llvm-dis | not grep {%z2 =}
+
+define i32 @main() {
+block1:
+	%z1 = bitcast i32 0 to i32
+	br label %block2
+block2:
+  %z2 = bitcast i32 0 to i32
+  ret i32 %z2
+}