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Allow errors to be deferred and emitted as part of clean up to simplify and shorten Assembly parser code. This will allow error messages to be emitted in helper functions and be modified by the caller which has better context. As part of this many minor cleanups to the Parser: * Unify parser cleanup on error * Add Workaround for incorrect return values in ParseDirective instances * Tighten checks on error-signifying return values for parser functions and fix in-tree TargetParsers to be more consistent with the changes. * Fix AArch64 test cases checking for spurious error messages that are now fixed. These changes should be backwards compatible with current Target Parsers so long as the error status are correctly returned in appropriate functions. Reviewers: rnk, majnemer Subscribers: aemerson, jyknight, llvm-commits Differential Revision: https://reviews.llvm.org/D24047 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@281249 91177308-0d34-0410-b5e6-96231b3b80d8
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