Adapted from https://github.com/digego/extempore/pull/322/files

--- a/include/llvm/IR/ValueMap.h	2015-08-04 00:30:24.000000000 +0200
+++ b/include/llvm/IR/ValueMap.h	2018-07-14 21:09:09.769502736 +0200
@@ -99,7 +99,7 @@
   explicit ValueMap(const ExtraData &Data, unsigned NumInitBuckets = 64)
       : Map(NumInitBuckets), Data(Data) {}

-  bool hasMD() const { return MDMap; }
+  bool hasMD() const { return static_cast<bool>(MDMap); }
   MDMapT &MD() {
     if (!MDMap)
       MDMap.reset(new MDMapT);
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<div class='path'>path: <a href='/guix/log/?id=3fee00395031a7144b108c2839fcbb570d5df8bd'>root</a>/<a href='/guix/log/tests?id=3fee00395031a7144b108c2839fcbb570d5df8bd'>tests</a>/<a href='/guix/log/tests/graph.scm?id=3fee00395031a7144b108c2839fcbb570d5df8bd'>graph.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/tests/graph.scm?id=3fee00395031a7144b108c2839fcbb570d5df8bd&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2017-01-04 16:18:53 +0100'>2017-01-04</span></td><td><a href='/guix/commit/tests/graph.scm?id=b96a0640a3ca128c0b9bf9acaef7b3b7a8bb1455'>graph: Add '%reverse-package-node-type'.</a><span class='msg-avail'>...<span class='msg-tooltip'>* guix/scripts/graph.scm (%reverse-package-node-type): New variable.
(%node-types): Add it.
* tests/graph.scm ("reverse package DAG"): New test.
* doc/guix.texi (Invoking guix refresh): Add cross-reference to
"Invoking guix graph".
(Invoking guix graph): Document 'reverse-package'.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2016-12-14 21:43:06 +0100'>2016-12-14</span></td><td><a href='/guix/commit/tests/graph.scm?id=51377437a1e37c9d5f2e137528e9c278b252d781'>graph: Backend must have name and description.</a><span class='msg-avail'>...<span class='msg-tooltip'>* guix/graph.scm (&lt;graph-backend&gt;): Add fields "name" and "description".
(%graphviz-backend): Provide values for name and description.
(export-graph): Ignore name and description when matching backends.
(graph-backend-name, graph-backend-description): New procedures.
* tests/graph.scm (make-recording-backend): Initialize name and
description fields of test graph-backend.
</span></span></td><td>Ricardo Wurmus</td></tr>
<tr><td><span title='2016-10-15 23:46:39 +0200'>2016-10-15</span></td><td><a href='/guix/commit/tests/graph.scm?id=7f8fec0fa40951de33822f86c31c32e3f3c5513e'>graph: Add '%referrer-node-type'.</a><span class='msg-avail'>...<span class='msg-tooltip'>* guix/scripts/graph.scm (ensure-store-items): New procedure.
(%reference-node-type)[convert]: Use it.
(non-derivation-referrers): New procedure.
(%referrer-node-type): New variable.
(%node-types): Add it.
* tests/graph.scm ("referrer DAG"): New test.
* doc/guix.texi (Invoking guix graph): Document it.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2016-05-24 00:06:01 +0200'>2016-05-24</span></td><td><a href='/guix/commit/tests/graph.scm?id=e144e3427da93b962c7620ce2bd64add8c83cfdc'>graph: Add 'node-reachable-count'.</a><span class='msg-avail'>...<span class='msg-tooltip'>* guix/graph.scm (node-reachable-count): New procedure.
* tests/graph.scm ("node-reachable-count"): New test.
</span></span></td><td>Ludovic Courtès</td></tr>