Pull in a #include to get std::size_t for Android GCE K

Change-Id: Ia2e2550fd333a3fd221ff4f8a5f46c215ca66be3
Reviewed-on: https://swiftshader-review.googlesource.com/2690
Reviewed-by: Nicolas Capens <capn@google.com>
Tested-by: Greg Hartman <ghartman@google.com>
diff --git a/src/LLVM/include/llvm/Support/type_traits.h b/src/LLVM/include/llvm/Support/type_traits.h
index 515295b..d069fbc 100644
--- a/src/LLVM/include/llvm/Support/type_traits.h
+++ b/src/LLVM/include/llvm/Support/type_traits.h
@@ -17,6 +17,7 @@
 #ifndef LLVM_SUPPORT_TYPE_TRAITS_H
 #define LLVM_SUPPORT_TYPE_TRAITS_H
 
+#include <cstddef>
 #include <utility>
 
 // This is actually the conforming implementation which works with abstract