[AArch64] Remove dotprod from base extension list
[AArch64] Remove dotprod from base extension list

Dot product is an optional ARMv8.2a extension; remove it from the ARMv8.2a base
extension list. This was introduced in commit r310480.

Differential Revision: https://reviews.llvm.org/D36609


git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@310708 91177308-0d34-0410-b5e6-96231b3b80d8

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