Two fixes for x86:

  - Remove the __force_oder definiton from the kaslr boot code as it is
    already defined in the page table code which makes GCC 10 builds fail
    because it changed the default to -fno-common.

  - Address the AMD erratum 1054 concerning the IRPERF capability and
    enable the Instructions Retired fixed counter on machines which are not
    affected by the erratum.
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