[PATCH] CodeGen: implement __emit intrinsic

[Saleem Abdulrasool]

Emit inserts exactly a single instruction.  It provides no guarantees of the state, so I don't think that we need to worry about LLVM doing something like inserting spills.


================
Comment at: test/CodeGen/builtins-arm-msvc-compat-error.c:8
@@ +7,3 @@
+
+// CHECK: fatal error: error in backend: constant value required!
+
----------------
rnk wrote:
> Why isn't sema catching this? I thought we had a builtin character code for that.
Ill take a look and see if I can find what you are referring to.  If you can point that out, that would be wonderful.  If we can catch this without a fatal error, that would be significantly better.

http://reviews.llvm.org/D3489

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