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='2019-03-26 14:18:12 +0100'>2019-03-26</span></td><td><a href='/guix/commit/etc/snippets/text-mode?id=6994e6743603ab73cc32d32786a55672f4fa46f0'>etc: Add "rename" snippet.</a><span class='msg-avail'>...<span class='msg-tooltip'>* etc/snippets/text-mode/guix-commit-message-rename-package: New file.
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<tr><td><span title='2019-03-08 00:17:30 +0100'>2019-03-08</span></td><td><a href='/guix/commit/etc/snippets/text-mode?id=95803946c7dbdff88db09fa5fe98e70d607712a7'>etc: snippets: Prefill package name.</a><span class='msg-avail'>...<span class='msg-tooltip'>* etc/snippets/text-mode/guix-commit-message-add-package: Extract package
name from diff.
</span></span></td><td>Ricardo Wurmus</td></tr>
<tr><td><span title='2019-03-07 23:55:24 +0100'>2019-03-07</span></td><td><a href='/guix/commit/etc/snippets/text-mode?id=d6234620ace1863d8102b065311ef3d94e0931da'>etc: snippets: Prefill package name and version.</a><span class='msg-avail'>...<span class='msg-tooltip'>* etc/snippets/text-mode/guix-commit-message-update-package: Extract package
name and version from git diff output.
</span></span></td><td>Ricardo Wurmus</td></tr>
<tr><td><span title='2018-07-13 12:45:11 +0530'>2018-07-13</span></td><td><a href='/guix/commit/etc/snippets/text-mode?id=9286c2950494b110e12d58d4ebd693d614120afe'>etc: snippets: Add guix-commit-message-use-https-home-page.</a><span class='msg-avail'>...<span class='msg-tooltip'>* etc/snippets/text-mode/guix-commit-message-use-https-home-page: New file.
* doc/contributing.texi (The Perfect Setup): Document new snippet.
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<tr><td><span title='2017-12-15 23:15:32 +0100'>2017-12-15</span></td><td><a href='/guix/commit/etc/snippets/text-mode?id=42cdcdff1945b112452029c6a79445aac15ffd16'>etc: Add snippets.</a><span class='msg-avail'>...<span class='msg-tooltip'>* etc/snippets/scheme-mode/guix-cvs-reference,
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* doc/contributing.texi (The Perfect Setup): Document snippets.
</span></span></td><td>Ricardo Wurmus</td></tr>