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[SVE][CodeGen] Add the ExtensionType flag to MGATHER

Authored by kmclaughlin on Dec 9 2020, 2:49 AM.

Description

[SVE][CodeGen] Add the ExtensionType flag to MGATHER

Adds the ExtensionType flag, which reflects the LoadExtType of a MaskedGatherSDNode.
Also updated SelectionDAGDumper::print_details so that details of the gather
load (is signed, is scaled & extension type) are printed.

Reviewed By: sdesmalen

Differential Revision: https://reviews.llvm.org/D91084