[llvm-mca] Remove field HasReadAdvanceEntries from class ReadDescriptor.
This simplifies the logic that updates RAW dependencies in the DispatchStage.
There is no advantage in storing that flag in the ReadDescriptor; we should
simply rely on the call to `STI.getReadAdvanceCycles()` to obtain the
ReadAdvance cycles. If there are no read-advance entries, then method
`getReadAdvanceCycles()` quickly returns 0.
No functional change intended.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@335977
91177308-0d34-0410-b5e6-
96231b3b80d8
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