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[SytemZ] Disable vector ABI when using option -march=arch[8|9|10]

Authored by Kai on Feb 5 2020, 12:08 PM.

Description

[SytemZ] Disable vector ABI when using option -march=arch[8|9|10]

When specifying -march=arch[8|9|10], those CPU types do NOT support
the vector extension. In this case the vector ABI must be disabled.
The generated data layout should NOT contain 64-v128.

Reviewers: uweigand

Differential Revision: https://reviews.llvm.org/D74146