Remove incorrect depromote calls.

Author: evoskuil

include/bitcoin/system/impl/math/bits.ipp

@@ -306,8 +306,7 @@ template <typename Value, if_unsigned_integral_integer<Value>>
 constexpr void shift_left_into(Value& value, size_t shift, bool overflow) NOEXCEPT
 {
     constexpr auto span = bits<Value>;
-    overflow && shift >= span ? value = 0 : depromote<Value>(
-        value <<= (shift % span));
+    overflow && shift >= span ? value = 0 : value <<= (shift % span);
 }
 
 // signed overloads (shift left of negative is undefined behavior).
@@ -337,8 +336,7 @@ template <typename Value, if_unsigned_integral_integer<Value>>
 constexpr void shift_right_into(Value& value, size_t shift, bool overflow) NOEXCEPT
 {
     constexpr auto span = bits<Value>;
-    overflow && shift >= span ? value = 0 : depromote<Value>(
-        value >>= (shift % span));
+    overflow && shift >= span ? value = 0 : value >>= (shift % span);
 }
 
 // signed overloads (shift right of negative is unspecified behavior).