I am using yasm to do some testing of my disassembler (udis86) and trying out 3dnow instructions, I found that the "pmulhrw" instruction was not supported. Turns out it was defined as "pmulhrwa". Unless I am missing something, this looks like a typo; so here's a quick fix for it.
Fix minor typo in the definition of pmulhrw
This change fixes the definition of "pmulhrw" where it is defined
as having the mnemonic "pmulhrwa".