[PATCH] [InstCombine][CodeGenPrep] Create llvm.uadd.with.overflow in CGP.

[Andrew Trick]

The logic looks good. The purpose of the lambda escapes me.


================
Comment at: lib/CodeGen/CodeGenPrepare.cpp:754-755
@@ +753,4 @@
+/// Return true if any changes were made.
+static bool CombineOverflowCheckIdiom(CmpInst *CI) {
+  auto CombineUAddWithOverflow = [](CmpInst *CI) {
+    Value *A, *B;
----------------
What am I missing here? Are we going to need a lambda somewhere?

http://reviews.llvm.org/D8889

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