Fix spelling of `propagate'.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@4423 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Transforms/Scalar/SCCP.cpp b/lib/Transforms/Scalar/SCCP.cpp
index 5ae9f52..2934697 100644
--- a/lib/Transforms/Scalar/SCCP.cpp
+++ b/lib/Transforms/Scalar/SCCP.cpp
@@ -482,7 +482,7 @@
   InstVal &VState = getValueState(V);
   if (VState.isOverdefined()) {        // Inherit overdefinedness of operand
     markOverdefined(&I);
-  } else if (VState.isConstant()) {    // Propogate constant value
+  } else if (VState.isConstant()) {    // Propagate constant value
     Constant *Result =
       ConstantFoldCastInstruction(VState.getConstant(), I.getType());