Fix parameter name comments using clang-tidy. NFC.

This patch applies clang-tidy's bugprone-argument-comment tool
to LLVM, clang and lld source trees. Here is how I created this
patch:

$ git clone https://github.com/llvm/llvm-project.git
$ cd llvm-project
$ mkdir build
$ cd build
$ cmake -GNinja -DCMAKE_BUILD_TYPE=Debug \
    -DLLVM_ENABLE_PROJECTS='clang;lld;clang-tools-extra' \
    -DCMAKE_EXPORT_COMPILE_COMMANDS=On -DLLVM_ENABLE_LLD=On \
    -DCMAKE_C_COMPILER=clang -DCMAKE_CXX_COMPILER=clang++ ../llvm
$ ninja
$ parallel clang-tidy -checks='-*,bugprone-argument-comment' \
    -config='{CheckOptions: [{key: StrictMode, value: 1}]}' -fix \
    ::: ../llvm/lib/**/*.{cpp,h} ../clang/lib/**/*.{cpp,h} ../lld/**/*.{cpp,h}

llvm-svn: 366177
diff --git a/clang/lib/Serialization/ASTReader.cpp b/clang/lib/Serialization/ASTReader.cpp
index c3f3a37..7f2c7f0 100644
--- a/clang/lib/Serialization/ASTReader.cpp
+++ b/clang/lib/Serialization/ASTReader.cpp
@@ -8252,7 +8252,7 @@
   // Update the state of pragmas. Use the same API as if we had encountered the
   // pragma in the source.
   if(OptimizeOffPragmaLocation.isValid())
-    SemaObj->ActOnPragmaOptimize(/* IsOn = */ false, OptimizeOffPragmaLocation);
+    SemaObj->ActOnPragmaOptimize(/* On = */ false, OptimizeOffPragmaLocation);
   if (PragmaMSStructState != -1)
     SemaObj->ActOnPragmaMSStruct((PragmaMSStructKind)PragmaMSStructState);
   if (PointersToMembersPragmaLocation.isValid()) {
diff --git a/clang/lib/Serialization/ASTReaderStmt.cpp b/clang/lib/Serialization/ASTReaderStmt.cpp
index 51a1e81..afaaa54 100644
--- a/clang/lib/Serialization/ASTReaderStmt.cpp
+++ b/clang/lib/Serialization/ASTReaderStmt.cpp
@@ -2861,7 +2861,7 @@
 
     case STMT_CXX_TRY:
       S = CXXTryStmt::Create(Context, Empty,
-             /*NumHandlers=*/Record[ASTStmtReader::NumStmtFields]);
+             /*numHandlers=*/Record[ASTStmtReader::NumStmtFields]);
       break;
 
     case STMT_CXX_FOR_RANGE:
diff --git a/clang/lib/Serialization/ASTWriter.cpp b/clang/lib/Serialization/ASTWriter.cpp
index a22e97a..10946f9 100644
--- a/clang/lib/Serialization/ASTWriter.cpp
+++ b/clang/lib/Serialization/ASTWriter.cpp
@@ -1447,7 +1447,7 @@
   Stream.EmitRecord(DIAGNOSTIC_OPTIONS, Record);
 
   // Write out the diagnostic/pragma mappings.
-  WritePragmaDiagnosticMappings(Diags, /* IsModule = */ WritingModule);
+  WritePragmaDiagnosticMappings(Diags, /* isModule = */ WritingModule);
 
   // Leave the options block.
   Stream.ExitBlock();
diff --git a/clang/lib/Serialization/GlobalModuleIndex.cpp b/clang/lib/Serialization/GlobalModuleIndex.cpp
index f90eab3..2db8f83 100644
--- a/clang/lib/Serialization/GlobalModuleIndex.cpp
+++ b/clang/lib/Serialization/GlobalModuleIndex.cpp
@@ -658,8 +658,8 @@
 
         // Find the imported module file.
         const FileEntry *DependsOnFile
-          = FileMgr.getFile(ImportedFile, /*openFile=*/false,
-                            /*cacheFailure=*/false);
+          = FileMgr.getFile(ImportedFile, /*OpenFile=*/false,
+                            /*CacheFailure=*/false);
 
         if (!DependsOnFile)
           return llvm::createStringError(std::errc::bad_file_descriptor,
diff --git a/clang/lib/Serialization/ModuleManager.cpp b/clang/lib/Serialization/ModuleManager.cpp
index 3e45b30..6ae0c4f 100644
--- a/clang/lib/Serialization/ModuleManager.cpp
+++ b/clang/lib/Serialization/ModuleManager.cpp
@@ -42,8 +42,8 @@
 using namespace serialization;
 
 ModuleFile *ModuleManager::lookupByFileName(StringRef Name) const {
-  const FileEntry *Entry = FileMgr.getFile(Name, /*openFile=*/false,
-                                           /*cacheFailure=*/false);
+  const FileEntry *Entry = FileMgr.getFile(Name, /*OpenFile=*/false,
+                                           /*CacheFailure=*/false);
   if (Entry)
     return lookup(Entry);
 
@@ -68,8 +68,8 @@
 
 std::unique_ptr<llvm::MemoryBuffer>
 ModuleManager::lookupBuffer(StringRef Name) {
-  const FileEntry *Entry = FileMgr.getFile(Name, /*openFile=*/false,
-                                           /*cacheFailure=*/false);
+  const FileEntry *Entry = FileMgr.getFile(Name, /*OpenFile=*/false,
+                                           /*CacheFailure=*/false);
   return std::move(InMemoryBuffers[Entry]);
 }
 
@@ -184,7 +184,7 @@
     } else {
       // Get a buffer of the file and close the file descriptor when done.
       Buf = FileMgr.getBufferForFile(NewModule->File,
-                                     /*IsVolatile=*/false,
+                                     /*isVolatile=*/false,
                                      /*ShouldClose=*/true);
     }
 
@@ -447,7 +447,7 @@
 
   // Open the file immediately to ensure there is no race between stat'ing and
   // opening the file.
-  File = FileMgr.getFile(FileName, /*openFile=*/true, /*cacheFailure=*/false);
+  File = FileMgr.getFile(FileName, /*OpenFile=*/true, /*CacheFailure=*/false);
   if (!File)
     return false;