X86: Fix the (saddo/ssub x, 1) -> incl/decl selection to check the right operand for 1.

Found by inspection.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127247 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/CodeGen/X86/add.ll b/test/CodeGen/X86/add.ll
index 62c8980..b95e5b5 100644
--- a/test/CodeGen/X86/add.ll
+++ b/test/CodeGen/X86/add.ll
@@ -133,3 +133,18 @@
 ; X64: subl
 ; X64: ret
 }
+
+define i1 @test10(i32 %x) nounwind {
+entry:
+  %t = call {i32, i1} @llvm.sadd.with.overflow.i32(i32 %x, i32 1)
+  %obit = extractvalue {i32, i1} %t, 1
+  ret i1 %obit
+
+; X32: test10:
+; X32: incl
+; X32-NEXT: seto
+
+; X64: test10:
+; X64: incl
+; X64-NEXT: seto
+}