C++: Support the __mfp8 floating point type

cpp/ql/lib/semmle/code/cpp/Type.qll

@@ -839,6 +839,9 @@ private predicate floatingPointTypeMapping(
   or
   // _Complex _Float128
   kind = 61 and base = 2 and domain = TComplexDomain() and realKind = 49 and extended = false
+  or
+  // __mfp8
+  kind = 62 and base = 2 and domain = TRealDomain() and realKind = 62 and extended = false
 }
 
 /**

cpp/ql/lib/semmlecode.cpp.dbscheme

@@ -691,6 +691,7 @@ case @builtintype.kind of
 | 59 = @complex_std_float64   // _Complex _Float64
 | 60 = @complex_float64x      // _Complex _Float64x
 | 61 = @complex_std_float128  // _Complex _Float128
+| 62 = @mfp8                  // __mfp8
 ;
 
 builtintypes(