x86/tools: objdump_reformat.awk: Ensure regex matches fwait

If there is "wait" mnemonic in the line being parsed, it is incorrectly
handled by the script, and an extra line of "fwait" in
objdump_reformat's output is inserted. As insn_decoder_test relies upon
the formatted output, the test fails.

This is reproducible when disassembling with llvm-objdump:

Pre-processed lines:

  ffffffff81033e72: 9b                    wait
  ffffffff81033e73: 48 c7 c7 89 50 42 82  movq

After objdump_reformat.awk:

  ffffffff81033e72:       9b      fwait
  ffffffff81033e72:                               wait
  ffffffff81033e73:       48 c7 c7 89 50 42 82    movq

The regex match now accepts spaces or tabs, along with the "fwait"
instruction.

Signed-off-by: Samuel Zeter <[email protected]>
Signed-off-by: Nathan Chancellor <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
Tested-by: Nathan Chancellor <[email protected]>
Tested-by: Kees Cook <[email protected]>
Reviewed-by: Kees Cook <[email protected]>
Acked-by: Masami Hiramatsu <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Closes: https://github.com/ClangBuiltLinux/linux/issues/1364

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