Fix minor typo in the definition of pmulhrw

This change fixes the definition of "pmulhrw" where it is defined
as having the mnemonic "pmulhrwa".

modules/arch/x86/gen_x86_insn.py

@@ -8120,7 +8120,7 @@ def output_groups(f):
 add_insn("pfsubr", "now3d", modifiers=[0xAA])
 add_insn("pi2fd", "now3d", modifiers=[0x0D])
 add_insn("pi2fw", "now3d", modifiers=[0x0C], cpu=["Athlon", "3DNow"])
-add_insn("pmulhrwa", "now3d", modifiers=[0xB7])
+add_insn("pmulhrw", "now3d", modifiers=[0xB7])
 add_insn("pswapd", "now3d", modifiers=[0xBB], cpu=["Athlon", "3DNow"])
 
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