[PATCH] Prevent repetetive warnings for unrecognized processors and features

[Artyom Skrobov]

Hello,

Right now, if I run

$ llc -mtriple armv7-arm-none-eabi -mcpu=invalid -mattr=+foo,+bar ~/test.ll

I receive six identical "unrecognized processor" warnings, and two identical
warnings for each unrecognized feature:

'invalid' is not a recognized processor for this target (ignoring processor)
'+foo' is not a recognized feature for this target (ignoring feature)
'+bar' is not a recognized feature for this target (ignoring feature)
'invalid' is not a recognized processor for this target (ignoring processor)
'invalid' is not a recognized processor for this target (ignoring processor)
'+foo' is not a recognized feature for this target (ignoring feature)
'+bar' is not a recognized feature for this target (ignoring feature)
'invalid' is not a recognized processor for this target (ignoring processor)
'invalid' is not a recognized processor for this target (ignoring processor)
'invalid' is not a recognized processor for this target (ignoring processor)

We propose a patch that reduces the code duplication and makes sure each
warning is emitted only once; and besides that, it uses SMDiagnostic::print
so that these warning messages are formatted and coloured up consistently
with the normal warning messages.

OK to commit?
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