Avoid clang-cl -Werror,-Wbitfield-constant-conversion

...when (non-negative) QueryOp enumerators LESS/GREATER_EQUAL are crammed into
a 2-bit meOp bitfield, where enums are implictly signed for MSVC, so the values
actually storable in the bitfield range from -2 to +1.

The clang-cl warning would go away when fixing the underlying type of QueryOp as
unsigned, but then GCC would start to emit "error:
‘ScLookupCache::QueryCriteria::meOp’ is too small to hold all values of ‘enum
ScLookupCache::QueryOp’ [-Werror]."

So don't bother with bitfields at all:  For QueryCritera, for one there's a
union member with a double and a pointer, so sizeof (QueryCriteria) will be
twice the size of double anyway; and for another, MSVC doesn't combine bitfields
of different type, so the bool members were separated from meOp anyway.  For
QueryKey the reason for a bitfield is even less clear cut, and it might only
have been there so that comparing (negative!) values read out of
QueryCritera::meOp compare equal to values read out of QueryKey::meOp under
MSVC.

Change-Id: I69fb068bea914c00a29001155218cb9f1b8f8a9a

sc/inc/lookupcache.hxx

@@ -64,9 +64,9 @@ public:
             double          mfVal;
             const OUString *mpStr;
         };
-        bool                mbAlloc  : 1;
-        bool                mbString : 1;
-        QueryOp             meOp     : 2;
+        bool                mbAlloc;
+        bool                mbString;
+        QueryOp             meOp;
 
         void deleteString()
         {
@@ -145,7 +145,7 @@ private:
     {
         SCROW           mnRow;
         SCTAB           mnTab;
-        QueryOp         meOp : 2;
+        QueryOp         meOp;
 
         QueryKey( const ScAddress & rAddress, const QueryOp eOp ) :
             mnRow( rAddress.Row()),