Remove imprecise statement.

Author: aemerson

llvm/docs/GlobalISel/Legalizer.rst

@@ -339,7 +339,7 @@ G_INTTOPTR have already been noted above. In addition to those, the following
 operations have requirements:
 
 * For every type that can be produced by any instruction, G_IMPLICIT_DEF must be
-  legal. This is usually trivial as it requires no code to be selected.
+  legal.
 * G_PHI must be legal for all types in the producer and consumer typesets. This
   is usually trivial as it requires no code to be selected.
 * At least one G_FRAME_INDEX must be legal