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Fix HIGH() and LOW() for constants

HIGH() and LOW() only worked with labels and register pairs.

Signed-off-by: Antonio Niño Díaz <antonio_nd@outlook.com>

--- a/src/asm/asmy.y

+++ b/src/asm/asmy.y

@@ -1234,6 +1234,8 @@

 const		: T_ID					{ $$ = sym_GetConstantValue($1); }

 		| T_NUMBER				{ $$ = $1; }

+		| T_OP_HIGH '(' const ')'		{ $$ = ($3 >> 8) & 0xFF; }

+		| T_OP_LOW '(' const ')'		{ $$ = $3 & 0xFF; }

 		| string				{ $$ = str2int($1); }

 		| T_OP_LOGICNOT const %prec NEG		{ $$ = !$2; }

 		| const T_OP_LOGICOR const		{ $$ = $1 || $3; }