Intel Tiger Lake Support Added To The LLVM Clang 10 Compiler

With the newest LLVM/Clang compiler code as of overnight, -march=tigerlake is now supported for targeting this Icelake successor to be manufactured on a 10nm+ process.
Tiger Lake uses the Willow Cove core and over Icelake adds AVX-512 VP2INTERSECT, MOVDIRI, MOVDIR64B, and SHSTK instruction set extensions -- at least for what's been publicly documented so far.
Kudos to Intel's software team for continuing to contribute their compiler enablement patches well in advance of the processor launches. In recent weeks we've also seen Intel's graphics team send out their initial Tigerlake/Gen12 graphics support code among other Linux enablement work for Tiger Lake.
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