[memprof] Fix comment typos (NFC)

Author: kazutakahirata

llvm/include/llvm/ProfileData/MemProf.h

@@ -988,7 +988,7 @@ computeFrameHistogram(llvm::MapVector<CallStackId, llvm::SmallVector<FrameId>>
 //
 // The radix tree allows us to reconstruct call stacks in the leaf-to-root
 // order as we scan the array from left ro right while following pointers to
-// parents along the way
+// parents along the way.
 //
 // For example, if we are decoding CallStackId 2, we start a forward traversal
 // at Index 7, noting the call stack length of 4 and obtaining f5 and f4.  When

llvm/lib/ProfileData/MemProf.cpp

@@ -394,7 +394,7 @@ Expected<MemProfSchema> readMemProfSchema(const unsigned char *&Buffer) {
     }
     Result.push_back(static_cast<Meta>(Tag));
   }
-  // Advace the buffer to one past the schema if we succeeded.
+  // Advance the buffer to one past the schema if we succeeded.
   Buffer = Ptr;
   return Result;
 }

llvm/lib/Transforms/IPO/MemProfContextDisambiguation.cpp

@@ -568,13 +568,13 @@ class CallsiteContextGraph {
   /// unioning their recorded alloc types.
   uint8_t computeAllocType(DenseSet<uint32_t> &ContextIds);
 
-  /// Returns the alloction type of the intersection of the contexts of two
+  /// Returns the allocation type of the intersection of the contexts of two
   /// nodes (based on their provided context id sets), optimized for the case
   /// when Node1Ids is smaller than Node2Ids.
   uint8_t intersectAllocTypesImpl(const DenseSet<uint32_t> &Node1Ids,
                                   const DenseSet<uint32_t> &Node2Ids);
 
-  /// Returns the alloction type of the intersection of the contexts of two
+  /// Returns the allocation type of the intersection of the contexts of two
   /// nodes (based on their provided context id sets).
   uint8_t intersectAllocTypes(const DenseSet<uint32_t> &Node1Ids,
                               const DenseSet<uint32_t> &Node2Ids);

llvm/lib/Transforms/Instrumentation/MemProfiler.cpp

@@ -839,7 +839,7 @@ readMemprof(Module &M, Function &F, IndexedInstrProfReader *MemProfReader,
   };
 
   // Now walk the instructions, looking up the associated profile data using
-  // dbug locations.
+  // debug locations.
   for (auto &BB : F) {
     for (auto &I : BB) {
       if (I.isDebugOrPseudoInst())
@@ -937,7 +937,7 @@ readMemprof(Module &M, Function &F, IndexedInstrProfReader *MemProfReader,
             // Add callsite metadata for the instruction's location list so that
             // it simpler later on to identify which part of the MIB contexts
             // are from this particular instruction (including during inlining,
-            // when the callsite metdata will be updated appropriately).
+            // when the callsite metadata will be updated appropriately).
             // FIXME: can this be changed to strip out the matching stack
             // context ids from the MIB contexts and not add any callsite
             // metadata here to save space?