Rebased PNaCl localmods in LLVM to 223109

test/NaCl/PNaClABI/abi-arithmetic-attributes.ll

+; RUN: not pnacl-abicheck < %s | FileCheck %s
+
+; This tests that the arithmetic attributes "nuw" and "nsw" ("no
+; unsigned wrap" and "no signed wrap") and "exact" are disallowed by
+; the PNaCl ABI verifier.
+
+define internal void @allowed_cases() {
+  %add = add i32 1, 2
+  %shl = shl i32 3, 4
+  %udiv = udiv i32 4, 2
+  %lshr = lshr i32 2, 1
+  %ashr = ashr i32 2, 1
+  ret void
+}
+; CHECK-NOT: disallowed
+
+
+define internal void @rejected_cases() {
+  %add = add nsw i32 1, 2
+; CHECK: disallowed: has "nsw" attribute: %add
+  %shl1 = shl nuw i32 3, 4
+; CHECK-NEXT: disallowed: has "nuw" attribute: %shl1
+  %sub = sub nsw nuw i32 5, 6
+; CHECK-NEXT: disallowed: has "nuw" attribute: %sub
+
+  %lshr = lshr exact i32 2, 1
+; CHECK-NEXT: disallowed: has "exact" attribute: %lshr
+  %ashr = ashr exact i32 2, 1
+; CHECK-NEXT: disallowed: has "exact" attribute: %ashr
+  %udiv = udiv exact i32 4, 2
+; CHECK-NEXT: disallowed: has "exact" attribute: %udiv
+
+  ret void
+}
+; CHECK-NOT: disallowed
+
+
+; This stops the verifier from complaining about the lack of an entry point.
+define void @_start(i32 %arg) {
+  ret void
+}