Make ComputeDemandedBits return a deterministic result when computing an AssertZext value.

In the added testcase the constant 55 was behind an AssertZext of type i1, and ComputeDemandedBits
reported that some of the bits were both known to be one and known to be zero.

Together with Michael Kuperstein <michael.m.kuperstein@intel.com>

llvm-svn: 160305

llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp

@@ -1965,6 +1965,7 @@ void SelectionDAG::ComputeMaskedBits(SDValue Op, APInt &KnownZero,
     APInt InMask = APInt::getLowBitsSet(BitWidth, VT.getSizeInBits());
     ComputeMaskedBits(Op.getOperand(0), KnownZero, KnownOne, Depth+1);
     KnownZero |= (~InMask);
+    KnownOne  &= (~KnownZero);
     return;
   }
   case ISD::FGETSIGN:

llvm/test/CodeGen/X86/2012-07-16-fp2ui-i1.ll

@@ -0,0 +1,12 @@
+; RUN: llc < %s -march=x86-64 -mcpu=corei7
+
+define void @autogen_SD3100() {
+BB:
+  %FC123 = fptoui float 0x40693F5D00000000 to i1
+  br i1 %FC123, label %V, label %W
+
+V:
+  ret void
+W:
+  ret void
+}