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Improve tablegen gen-subtarget diagnostics for missing machine models.

Description

Improve tablegen gen-subtarget diagnostics for missing machine models.

-debug-only=subtarget-emitter prints a lot of machine model diagnostics.
This prunes the output so that the "No machine model for XXX on processor YYY"
only appears when there is definitely no machine model for that opcode.
Previously it was printing that error even if the opcode was covered by
a more general scheduling class.

rdar://problem/15919845 [TableGen][CodeGenSchedule] Debug output does not help spotting the missing scheduling classes

Details

Committed
atrickOct 17 2016, 9:17 PM
Parents
rL284451: [AVX-512] Fix DecodeVPERMV3Mask to handle cases where the constant pool entry…
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