Opaque Pointer Types: GEP API migrations to specify the gep type explicitly

The changes to InstCombine do seem a bit silly - it doesn't make
anything obviously better to have the caller access the pointers element
type (the thing I'm trying to remove) than the GEP itself, but it's a
helpful migration step. This will allow me to more obviously lock down
GEP (& Load, etc) API usage, then fix all the code that accesses pointer
element types except the places that need to be removed (most of the
InstCombines) anyway - at which point I'll need to just remove all that
code because it won't be meaningful anymore (there will be no pointer
types, so no bitcasts to combine)

llvm-svn: 233126
diff --git a/llvm/lib/CodeGen/SjLjEHPrepare.cpp b/llvm/lib/CodeGen/SjLjEHPrepare.cpp
index 35e4292..2335a88 100644
--- a/llvm/lib/CodeGen/SjLjEHPrepare.cpp
+++ b/llvm/lib/CodeGen/SjLjEHPrepare.cpp
@@ -128,7 +128,8 @@
   Value *Zero = ConstantInt::get(Int32Ty, 0);
   Value *One = ConstantInt::get(Int32Ty, 1);
   Value *Idxs[2] = { Zero, One };
-  Value *CallSite = Builder.CreateGEP(FuncCtx, Idxs, "call_site");
+  Value *CallSite =
+      Builder.CreateGEP(FunctionContextTy, FuncCtx, Idxs, "call_site");
 
   // Insert a store of the call-site number
   ConstantInt *CallSiteNoC =