[PATCH] Emit DWARF3 call frame information when DWARF3+ debug info is requested

[Eric Christopher]

Not to hijack Dave's review, but looks good to me in general.

-eric

================
Comment at: lib/MC/MCDwarf.cpp:1273
@@ -1272,2 +1272,3 @@
   if (verboseAsm) streamer.AddComment("DW_CIE_VERSION");
-  streamer.EmitIntValue(dwarf::DW_CIE_VERSION, 1);
+  uint8_t CIEVersion = context.getDwarfVersion() <= 2 ? 1 : 3;
+  streamer.EmitIntValue(CIEVersion, 1);
----------------
Comment on the version that we're adding as 1 for < 3, and 3 for >= 3 would be nice.


================
Comment at: lib/MC/MCDwarf.cpp:1306
@@ +1305,3 @@
+    streamer.EmitIntValue(MRI->getDwarfRegNum(MRI->getRARegister(), true), 1);
+  } else
+    streamer.EmitULEB128IntValue(
----------------
I think the general style is "if one half has braces they both do" but I'm not wedded to it.

http://reviews.llvm.org/D4027