[NFC] Fix spelling 'constanst' -> 'constants'

Author: frasercrmck

llvm/include/llvm/IR/Value.h

@@ -242,7 +242,7 @@ class Value {
   ///
   /// This is useful when you just want to print 'int %reg126', not the
   /// instruction that generated it. If you specify a Module for context, then
-  /// even constanst get pretty-printed; for example, the type of a null
+  /// even constants get pretty-printed; for example, the type of a null
   /// pointer is printed symbolically.
   /// @{
   void printAsOperand(raw_ostream &O, bool PrintType = true,

llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp

@@ -10286,7 +10286,7 @@ SDValue DAGCombiner::visitSRA(SDNode *N) {
   // If truncate is free for the target sext(shl) is likely to result in better
   // code.
   if (N0.getOpcode() == ISD::SHL && N1C) {
-    // Get the two constanst of the shifts, CN0 = m, CN = n.
+    // Get the two constants of the shifts, CN0 = m, CN = n.
     const ConstantSDNode *N01C = isConstOrConstSplat(N0.getOperand(1));
     if (N01C) {
       LLVMContext &Ctx = *DAG.getContext();