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[MC] Implement EmitRawText in MCNullStreamer
Summary: This adds dummy implementation of `EmitRawText` in `MCNullStreamer`. This fixes the behavior of `AsmPrinter` with `MCNullStreamer` on targets on which no integrated assembler is used. An attempt to emit inline asm on such a target would previously lead to a crash, since `AsmPrinter` does not check for `hasRawTextSupport` in `EmitInlineAsm` and calls `EmitRawText` anyway if integrated assembler is disabled (the behavior has changed in D2686). Error message printed by MCStreamer: > EmitRawText called on an MCStreamer that doesn't support it, something > must not be fully mc'ized Patch by Eugene Sharygin Reviewers: dsanders, echristo Reviewed By: dsanders Subscribers: eraman, llvm-commits Differential Revision: https://reviews.llvm.org/D53938 llvm-svn: 345841
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