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/CodeGen/CGException.cpp b/clang/lib/CodeGen/CGException.cpp
index 748029b..3b7a88a 100644
--- a/clang/lib/CodeGen/CGException.cpp
+++ b/clang/lib/CodeGen/CGException.cpp
@@ -32,7 +32,7 @@
   // void __cxa_free_exception(void *thrown_exception);
 
   llvm::FunctionType *FTy =
-    llvm::FunctionType::get(CGM.VoidTy, CGM.Int8PtrTy, /*IsVarArgs=*/false);
+    llvm::FunctionType::get(CGM.VoidTy, CGM.Int8PtrTy, /*isVarArg=*/false);
 
   return CGM.CreateRuntimeFunction(FTy, "__cxa_free_exception");
 }
@@ -41,7 +41,7 @@
   // void __cxa_call_unexpected(void *thrown_exception);
 
   llvm::FunctionType *FTy =
-    llvm::FunctionType::get(CGM.VoidTy, CGM.Int8PtrTy, /*IsVarArgs=*/false);
+    llvm::FunctionType::get(CGM.VoidTy, CGM.Int8PtrTy, /*isVarArg=*/false);
 
   return CGM.CreateRuntimeFunction(FTy, "__cxa_call_unexpected");
 }
@@ -50,7 +50,7 @@
   // void __terminate();
 
   llvm::FunctionType *FTy =
-    llvm::FunctionType::get(VoidTy, /*IsVarArgs=*/false);
+    llvm::FunctionType::get(VoidTy, /*isVarArg=*/false);
 
   StringRef name;
 
@@ -75,7 +75,7 @@
 static llvm::FunctionCallee getCatchallRethrowFn(CodeGenModule &CGM,
                                                  StringRef Name) {
   llvm::FunctionType *FTy =
-    llvm::FunctionType::get(CGM.VoidTy, CGM.Int8PtrTy, /*IsVarArgs=*/false);
+    llvm::FunctionType::get(CGM.VoidTy, CGM.Int8PtrTy, /*isVarArg=*/false);
 
   return CGM.CreateRuntimeFunction(FTy, Name);
 }