Patch 10 for long double. Doing constants right needs expanding ConstantFP

to handle values bigger than double.  If we assume host==target and host
long double works correctly, this is not too bad, but we don't want to
have that limitation longterm.  I could implement accepting double
constants as long double or something like that, which would lead to
incorrect codegen with no errors; the more I think about that the worse
it seems.  Rather than do such a hack that would be backed out later,
I'm settling for giving reasonable error messages, for now.

llvm-svn: 40974

llvm/lib/Bitcode/Reader/BitcodeReader.cpp

@@ -629,6 +629,10 @@ bool BitcodeReader::ParseConstants() {
         V = ConstantFP::get(CurTy, BitsToFloat(Record[0]));
       else if (CurTy == Type::DoubleTy)
         V = ConstantFP::get(CurTy, BitsToDouble(Record[0]));
+      // FIXME: Make long double constants work.
+      else if (CurTy == Type::X86_FP80Ty ||
+               CurTy == Type::FP128Ty || CurTy == Type::PPC_FP128Ty)
+        assert(0 && "Long double constants not handled yet.");
       else
         V = UndefValue::get(CurTy);
       break;