[Bug 295431] CURRENT compiler miscompiles lang/mit-scheme

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=295431

--- Comment #9 from Dimitry Andric <dim@FreeBSD.org> ---
(In reply to Dimitry Andric from comment #8)
> Do you mean that the "mov %rcx, 0" goes away, or also that the whole port then builds?

Never mind, I built llvm main with:

--- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
@@ -4589,7 +4589,7 @@ void SelectionDAGBuilder::visitGetElementPtr(const User
&I) {
       // offset, also interpreted as an unsigned number, does not wrap the
       // pointer index type (add nuw).
       SDNodeFlags AddFlags;
-      AddFlags.setNoUnsignedWrap(NW.hasNoUnsignedWrap());
+      //AddFlags.setNoUnsignedWrap(NW.hasNoUnsignedWrap());
       AddFlags.setInBounds(NW.isInBounds());

       N = DAG.getMemBasePlusOffset(N, IdxN, dl, AddFlags);

and the lang/mit-scheme build no longer segfaults. (I still get the 'Generating
SCode for file: "blowfish.scm" => "blowfish.bin"... aborted' error though,
wonder what's up with that.)

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