PNaCl: Add ReplacePtrsWithInts pass for stripping out pointer types

ReplacePtrsWithInts converts IR to a normal form in which functions
don't reference any aggregate pointer types and pointer types only
appear inside a few instructions.

Change BlockAddress::replaceUsesOfWithOnConstant() to handle changing
a function's type by replacing a function with a bitcast ConstantExpr
of a new function.

BUG=https://code.google.com/p/nativeclient/issues/detail?id=3343
TEST=replace-ptrs-with-ints.ll + PNaCl toolchain trybots, torture tests, etc.

Review URL: https://codereview.chromium.org/14262011

1 files changed, 5 insertions, 0 deletions

diff --git a/lib/Transforms/NaCl/ExpandUtils.cpp b/lib/Transforms/NaCl/ExpandUtils.cpp
index 0670ff75ce..507760603f 100644
--- a/lib/Transforms/NaCl/ExpandUtils.cpp
+++ b/lib/Transforms/NaCl/ExpandUtils.cpp
@@ -38,3 +38,8 @@ void llvm::PhiSafeReplaceUses(Use *U, Value *NewVal) {
     U->getUser()->replaceUsesOfWith(U->get(), NewVal);
   }
 }
+
+Instruction *llvm::CopyDebug(Instruction *NewInst, Instruction *Original) {
+  NewInst->setDebugLoc(Original->getDebugLoc());
+  return NewInst;
+}