Erich Keane 3ec1743d0d Make march/target-cpu print a note with the list of valid values for ARM ...

When rejecting a march= or target-cpu command line parameter,
the message is quite lacking. This patch adds a note that prints
all possible values for the current target, if the target supports it.

This adds support for the ARM/AArch64 targets (more to come!). 

Differential Revision: https://reviews.llvm.org/D42978 

llvm-svn: 324673

2018-02-08 23:14:15 +00:00

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