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/Sema/SemaStmt.cpp b/clang/lib/Sema/SemaStmt.cpp
index 0e5881e3..480155d 100644
--- a/clang/lib/Sema/SemaStmt.cpp
+++ b/clang/lib/Sema/SemaStmt.cpp
@@ -2447,7 +2447,7 @@
 
         ExprResult SizeOfVLAExprR = ActOnUnaryExprOrTypeTraitExpr(
             EndVar->getLocation(), UETT_SizeOf,
-            /*isType=*/true,
+            /*IsType=*/true,
             CreateParsedType(VAT->desugar(), Context.getTrivialTypeSourceInfo(
                                                  VAT->desugar(), RangeLoc))
                 .getAsOpaquePtr(),
@@ -2457,7 +2457,7 @@
 
         ExprResult SizeOfEachElementExprR = ActOnUnaryExprOrTypeTraitExpr(
             EndVar->getLocation(), UETT_SizeOf,
-            /*isType=*/true,
+            /*IsType=*/true,
             CreateParsedType(VAT->desugar(),
                              Context.getTrivialTypeSourceInfo(
                                  VAT->getElementType(), RangeLoc))