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/llvm/lib/Target/AArch64/AArch64FastISel.cpp b/llvm/lib/Target/AArch64/AArch64FastISel.cpp
index 9119461..8dc2768 100644
--- a/llvm/lib/Target/AArch64/AArch64FastISel.cpp
+++ b/llvm/lib/Target/AArch64/AArch64FastISel.cpp
@@ -2365,7 +2365,7 @@
                                         AArch64::sub_32);
 
   if ((BW < 32) && !IsBitTest)
-    SrcReg = emitIntExt(VT, SrcReg, MVT::i32, /*IsZExt=*/true);
+    SrcReg = emitIntExt(VT, SrcReg, MVT::i32, /*isZExt=*/true);
 
   // Emit the combined compare and branch instruction.
   SrcReg = constrainOperandRegClass(II, SrcReg,  II.getNumDefs());
@@ -4272,7 +4272,7 @@
   const TargetRegisterClass *RC =
       (RetVT == MVT::i64) ? &AArch64::GPR64RegClass : &AArch64::GPR32RegClass;
   if (NeedTrunc) {
-    Op0Reg = emitIntExt(RetVT, Op0Reg, MVT::i32, /*IsZExt=*/false);
+    Op0Reg = emitIntExt(RetVT, Op0Reg, MVT::i32, /*isZExt=*/false);
     Op1Reg = emitAnd_ri(MVT::i32, Op1Reg, Op1IsKill, Mask);
     Op0IsKill = Op1IsKill = true;
   }
@@ -4952,7 +4952,7 @@
   MVT PtrVT = TLI.getPointerTy(DL);
   EVT IdxVT = EVT::getEVT(Idx->getType(), /*HandleUnknown=*/false);
   if (IdxVT.bitsLT(PtrVT)) {
-    IdxN = emitIntExt(IdxVT.getSimpleVT(), IdxN, PtrVT, /*IsZExt=*/false);
+    IdxN = emitIntExt(IdxVT.getSimpleVT(), IdxN, PtrVT, /*isZExt=*/false);
     IdxNIsKill = true;
   } else if (IdxVT.bitsGT(PtrVT))
     llvm_unreachable("AArch64 FastISel doesn't support types larger than i64");