[turbofan] Fix loading of JSFunction from activation in case of adapter frame.

src/compiler/ppc/code-generator-ppc.cc

Index: src/compiler/ppc/code-generator-ppc.cc
diff --git a/src/compiler/ppc/code-generator-ppc.cc b/src/compiler/ppc/code-generator-ppc.cc
index b843ad698536d045bc8ce1a0345864d78464f50d..b26205408834b08829ac5822bb86ca45abde6250 100644
--- a/src/compiler/ppc/code-generator-ppc.cc
+++ b/src/compiler/ppc/code-generator-ppc.cc
@@ -1221,6 +1221,8 @@ void CodeGenerator::AssemblePrologue() {
     // remaining stack slots.
     if (FLAG_code_comments) __ RecordComment("-- OSR entrypoint --");
     osr_pc_offset_ = __ pc_offset();
+    // TODO(titzer): cannot address target function == local #-1
+    __ lwa(r4, MemOperand(fp, JavaScriptFrameConstants::kFunctionOffset));
     DCHECK(stack_slots >= frame()->GetOsrStackSlotCount());
     stack_slots -= frame()->GetOsrStackSlotCount();
   }