[PATCH] Prologue support

[Ben Gamari]

>>! In D6454#13, @pcc wrote:
> LGTM
> 
> Do you have commit access?
> 
I do not.

> As I mentioned, this will require a trivial change to Clang (`s/setPrefixData/setPrologueData/` in `lib/CodeGen/CodeGenFunction.cpp`).
> 
Yep, I'm on it.

Thanks!

================
Comment at: docs/BitCodeFormat.rst:796
@@ +795,3 @@
+* *prologue*: If non-zero, the value index of the prologue data for this function,
+  plus 1.
+
----------------
pcc wrote:
> Nit: these should use the same identifiers and be in the same order as the record spec above.
Completely reasonable.

http://reviews.llvm.org/D6454