https://bugs.kde.org/show_bug.cgi?id=422174

--- Comment #6 from Mark Wielaard <m...@klomp.org> ---
Created attachment 130413
  --> https://bugs.kde.org/attachment.cgi?id=130413&action=edit
Handle REX prefixed JMP instruction.

I went over the instructions that had the 'f64' note attached: "The operand
size is forced to a 64-bit operand size when in 64-bit mode (prefixes that
change operand size are ignored for this instruction in 64-bit mode)."

It looks like we handle that as intended for all instructions, except for two
JMP variants.

So I believe this patch is correct (it also makes a simple .net Core program
run under valgrind).

The original sz check and comment come from the x86 backend, and were copied
over when the amd64 backend was added.

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