[NFC] fix some typos in LoopUnrollPass

This patch fixes a couple of typos in the LoopUnrollPass.cpp comments

Differential Revision: https://reviews.llvm.org/D89603

Author: tammela

llvm/lib/Transforms/Scalar/LoopUnrollPass.cpp

@@ -76,7 +76,7 @@ using namespace llvm;
 cl::opt<bool> llvm::ForgetSCEVInLoopUnroll(
     "forget-scev-loop-unroll", cl::init(false), cl::Hidden,
     cl::desc("Forget everything in SCEV when doing LoopUnroll, instead of just"
-             " the current top-most loop. This is somtimes preferred to reduce"
+             " the current top-most loop. This is sometimes preferred to reduce"
              " compile time."));
 
 static cl::opt<unsigned>
@@ -1041,7 +1041,7 @@ static LoopUnrollResult tryToUnrollLoop(
     return LoopUnrollResult::Unmodified;
   }
 
-  // When automtatic unrolling is disabled, do not unroll unless overridden for
+  // When automatic unrolling is disabled, do not unroll unless overridden for
   // this loop.
   if (OnlyWhenForced && !(TM & TM_Enable))
     return LoopUnrollResult::Unmodified;
@@ -1103,7 +1103,7 @@ static LoopUnrollResult tryToUnrollLoop(
   // If the loop contains a convergent operation, the prelude we'd add
   // to do the first few instructions before we hit the unrolled loop
   // is unsafe -- it adds a control-flow dependency to the convergent
-  // operation.  Therefore restrict remainder loop (try unrollig without).
+  // operation.  Therefore restrict remainder loop (try unrolling without).
   //
   // TODO: This is quite conservative.  In practice, convergent_op()
   // is likely to be called unconditionally in the loop.  In this