Cherry-pick r322885 from LLVM.

This fixes a build issue when building with libc++ on Windows. Bug: chromium:801780 Change-Id: I8fa84cefa272c2f3b096b2aada793192a47cc0e3 Reviewed-on: https://swiftshader-review.googlesource.com/16468Reviewed-by: Nicolas Capens <nicolascapens@google.com> Tested-by: Peter Collingbourne <pcc@google.com>

Cherry-pick r322885 from LLVM.
c715a8ec · Peter Collingbourne · 8e67eb9d · c715a8ec
Commit c715a8ec authored Jan 18, 2018 by Peter Collingbourne
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NativeFormatting.cpp third_party/llvm-subzero/lib/Support/NativeFormatting.cpp +2 -0

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--- a/third_party/llvm-subzero/lib/Support/NativeFormatting.cpp
+++ b/third_party/llvm-subzero/lib/Support/NativeFormatting.cpp
@@ -14,6 +14,8 @@
 #include "llvm/ADT/StringExtras.h"
 #include "llvm/Support/Format.h"

+#include <float.h>
+
 using namespace llvm;

 template<typename T, std::size_t N>