[CodeView] Implement .cv_inline_linetable

This support is _very_ rudimentary, just enough to get some basic data
into the CodeView debug section.

Left to do is:
- Use the combined opcodes to save space.
- Do something about code offsets.

llvm-svn: 259230
diff --git a/llvm/lib/MC/MCStreamer.cpp b/llvm/lib/MC/MCStreamer.cpp
index adae5d7..1f445ca 100644
--- a/llvm/lib/MC/MCStreamer.cpp
+++ b/llvm/lib/MC/MCStreamer.cpp
@@ -196,6 +196,10 @@
                                           const MCSymbol *Begin,
                                           const MCSymbol *End) {}
 
+void MCStreamer::EmitCVInlineLinetableDirective(
+    unsigned PrimaryFunctionId, unsigned SourceFileId, unsigned SourceLineNum,
+    ArrayRef<unsigned> SecondaryFunctionIds) {}
+
 void MCStreamer::EmitEHSymAttributes(const MCSymbol *Symbol,
                                      MCSymbol *EHSymbol) {
 }