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[TargetParser][ARM] Account dependencies when processing target features

Authored by labrinea on Jul 14 2019, 1:31 PM.

Description

[TargetParser][ARM] Account dependencies when processing target features

Teaches ARM::appendArchExtFeatures to account dependencies when processing
target features: i.e. when you say -march=armv8.1-m.main+mve.fp+nofp it
means mve.fp should get discarded too. (Split from D63936)

Differential Revision: https://reviews.llvm.org/D64048

llvm-svn: 366031