feature is set, then the features in the implied list should be set also.
The opposite is also enforced: if a feature in the implied list isn't set,
then the feature that owns that implies list shouldn't be set either.

llvm-svn: 36756

llvm-svn: 32340

llvm-svn: 32333

llvm-svn: 27064

llvm-svn: 25661

CPU.

llvm-svn: 23974

llvm-svn: 23905

llvm-svn: 23893

use LowercaseString from StringExtras.h, remove extraneous space from help
output.

llvm-svn: 23891

'' is not a recognized processor for this target (ignoring processor)

instead of:

 is not a recognized processor for this target (ignoring processor)

llvm-svn: 23256

llvm-svn: 23222

llvm-svn: 23210

is to manage processor specific attributes from the command line.  See examples
of use in llc/lli and PowerPCTargetSubtarget.

llvm-svn: 23191