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90a74252e6
This adds reportError to MCContext, which can be used as an alternative to reportFatalError when the assembler wants to try to continue processing the rest of the file after the error is reported, so that all of the errors ina file can be reported. It records the fact that an error was encountered, so we can avoid emitting an object file if any errors occurred. This patch doesn't add any uses of this function (a later patch will convert most uses of reportFatalError to use it), but there is a small functional change: we use the SourceManager to print the error message, even if we have a null SMLoc. This means that we get a SourceManager-style message, with the file and line information shown as <unknown>, rather than the "LLVM ERROR" style used by report_fatal_error. llvm-svn: 253327
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