[llvm-mca] Support for in-order CPU for -instruction-tables testing.

Added Intel Atom tests to verify that the tool correctly generates instruction
tables even if the CPU is in-order.

Fixes PR37282.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@331169 91177308-0d34-0410-b5e6-96231b3b80d8
8 files changed