Temporarily revert r61027. It was causing a bootstrap failure in "release" mode

with everyone's favorite error messages:

Comparing stages 2 and 3
warning: ./cc1-checksum.o differs
warning: ./cc1plus-checksum.o differs
Bootstrap comparison failure!
./c-decl.o differs
./cp/decl.o differs
./df-core.o differs
./gcc.o differs
./i386.o differs
./stor-layout.o differs
./tree-pretty-print.o differs
./tree.o differs
make[2]: *** [compare] Error 1
make[1]: *** [stage3-bubble] Error 2

See PR3227.

llvm-svn: 61169

llvm/lib/Transforms/Scalar/GVN.cpp

@@ -48,7 +48,7 @@ STATISTIC(NumPRELoad, "Number of loads PRE'd");
 
 static cl::opt<bool> EnablePRE("enable-pre",
                                cl::init(true), cl::Hidden);
-cl::opt<bool> EnableLoadPRE("enable-load-pre", cl::init(true));
+cl::opt<bool> EnableLoadPRE("enable-load-pre"/*, cl::init(true)*/);
 
 //===----------------------------------------------------------------------===//
 //                         ValueTable Class
@@ -957,11 +957,6 @@ bool GVN::processNonLocalLoad(LoadInst *LI,
   if (Deps.size() > 100)
     return false;
   
-  // If we had a phi translation failure, we'll have a single entry which is a
-  // clobber in the current block.  Reject this early.
-  if (Deps.size() == 1 && Deps[0].second.isClobber())
-    return false;
-  
   // Filter out useless results (non-locals, etc).  Keep track of the blocks
   // where we have a value available in repl, also keep track of whether we see
   // dependencies that produce an unknown value for the load (such as a call