Patch from https://github.com/digego/extempore/issues/318

diff --git a/include/llvm/IR/ValueMap.h.orig b/include/llvm/IR/ValueMap.h
index ad518ac..d928f6a 100644
--- a/include/llvm/IR/ValueMap.h
+++ b/include/llvm/IR/ValueMap.h
@@ -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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<tr><td><span title='2018-05-28 13:24:19 +0200'>2018-05-28</span></td><td><a href='/guix/commit/gnu/build/shepherd.scm?id=9ceeca0880248eee8c2796f5e6ebc172b95277f7'>system: Remove uses of the 'title' field of &lt;file-system&gt;.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/system/install.scm (installation-os): Remove uses of the 'title'
field of 'file-system'; use 'file-system-label' as appropriate.
* gnu/system/vm.scm (system-disk-image, system-qemu-image): Likewise.
* gnu/tests.scm (%simple-os): Likewise.
* gnu/tests/install.scm (%minimal-os, %minimal-extlinux-os)
(%minimal-os-on-vda, %separate-home-os, %separate-store-os)
(%raid-root-os, %encrypted-root-os, %btrfs-root-os): Likewise.
* gnu/build/shepherd.scm (default-mounts)[tmpfs]: Likewise.
* tests/guix-system.sh: Likewise.
* tests/system.scm (%root-fs): Likewise.
("operating-system-boot-mapped-devices, implicit dependency"): Likewise.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2017-11-22 23:02:35 +0100'>2017-11-22</span></td><td><a href='/guix/commit/gnu/build/shepherd.scm?id=0cb9c9d1702b65613a81a3e56255dcc38939841a'>shepherd: Include /etc/group in service containers.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/build/shepherd.scm (default-mounts)[passwd]: Rename to...
[accounts]: ... this.  Add /etc/group.
</span></span></td><td>Ludovic Courtès</td></tr>