Add sub/mul overflow intrinsics. This currently doesn't have a

target-independent way of determining overflow on multiplication. It's very
tricky. Patch by Zoltan Varga!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60800 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/CodeGen/SelectionDAGNodes.h

@@ -259,6 +259,12 @@ namespace ISD {
     // These nodes are generated from the llvm.[su]add.with.overflow intrinsics.
     SADDO, UADDO,
 
+    // Same for subtraction
+    SSUBO, USUBO,
+
+    // Same for multiplication
+    SMULO, UMULO,
+
     // Simple binary floating point operators.
     FADD, FSUB, FMUL, FDIV, FREM,