Patch by GM: Making implicit conversion to bool explicit in <ios> and <__locale>

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@193085 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/ios b/include/ios
index 0dd328d..d95f18a 100644
--- a/include/ios
+++ b/include/ios
@@ -535,21 +535,21 @@
 bool
 ios_base::eof() const
 {
-    return __rdstate_ & eofbit;
+    return (__rdstate_ & eofbit) != 0;
 }
 
 inline _LIBCPP_INLINE_VISIBILITY
 bool
 ios_base::fail() const
 {
-    return __rdstate_ & (failbit | badbit);
+    return (__rdstate_ & (failbit | badbit)) != 0;
 }
 
 inline _LIBCPP_INLINE_VISIBILITY
 bool
 ios_base::bad() const
 {
-    return __rdstate_ & badbit;
+    return (__rdstate_ & badbit) != 0;
 }
 
 inline _LIBCPP_INLINE_VISIBILITY