Add more i1 optimizations. add, sub, mul, s/udiv on i1 are now simplified away.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@51817 91177308-0d34-0410-b5e6-96231b3b80d8

test/Transforms/InstCombine/2008-05-31-Bools.ll

@@ -0,0 +1,24 @@
+; RUN: llvm-as < %s | opt -instcombine | llvm-dis > %t
+; RUN: grep {xor} %t
+; RUN: grep {and} %t
+; RUN: not grep {div} %t
+
+define i1 @foo1(i1 %a, i1 %b) {
+  %A = sub i1 %a, %b
+  ret i1 %A
+}
+
+define i1 @foo2(i1 %a, i1 %b) {
+  %A = mul i1 %a, %b
+  ret i1 %A
+}
+
+define i1 @foo3(i1 %a, i1 %b) {
+  %A = udiv i1 %a, %b
+  ret i1 %A
+}
+
+define i1 @foo4(i1 %a, i1 %b) {
+  %A = sdiv i1 %a, %b
+  ret i1 %A
+}