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Comment on REG_SP and REG_AF both being 3

No instruction needs to distinguish them both

--- a/src/asm/parser.y

+++ b/src/asm/parser.y

@@ -392,6 +392,7 @@

 	REG_BC = 0,

 	REG_DE = 1,

 	REG_HL = 2,

+	// LD/INC/ADD/DEC allow SP, PUSH/POP allow AF

 	REG_SP = 3,

 	REG_AF = 3

 };