Fix formatting of inline argument comments. NFC.

[sbc100]

Summary

Also, remove the final arg from ItaniumCXXABI in the PNaCl case since
its not needed.

clang/lib/CodeGen/ItaniumCXXABI.cpp

bool isVTableHidden(const CXXRecordDecl *RD) const {
     }
     return false;
   }
 };
 
 class ARMCXXABI : public ItaniumCXXABI {
 public:
   ARMCXXABI(CodeGen::CodeGenModule &CGM) :
-    ItaniumCXXABI(CGM, /* UseARMMethodPtrABI = */ true,
-                  /* UseARMGuardVarABI = */ true) {}
+    ItaniumCXXABI(CGM, /*UseARMMethodPtrABI=*/true,
+                  /*UseARMGuardVarABI=*/true) {}
 
   bool HasThisReturn(GlobalDecl GD) const override {
     return (isa<CXXConstructorDecl>(GD.getDecl()) || (
               isa<CXXDestructorDecl>(GD.getDecl()) &&
               GD.getDtorType() != Dtor_Deleting));
   }
 
   void EmitReturnFromThunk(CodeGenFunction &CGF, RValue RV,
CodeGen::CGCXXABI *CodeGen::CreateItaniumCXXABI(CodeGenModule &CGM) {
 
   case TargetCXXABI::iOS64:
     return new iOS64CXXABI(CGM);
 
   // Note that AArch64 uses the generic ItaniumCXXABI class since it doesn't
   // include the other 32-bit ARM oddities: constructor/destructor return values
   // and array cookies.
   case TargetCXXABI::GenericAArch64:
-    return new ItaniumCXXABI(CGM, /* UseARMMethodPtrABI = */ true,
-                             /* UseARMGuardVarABI = */ true);
+    return new ItaniumCXXABI(CGM, /*UseARMMethodPtrABI=*/true,
+                             /*UseARMGuardVarABI=*/true);
 
   case TargetCXXABI::GenericMIPS:
-    return new ItaniumCXXABI(CGM, /* UseARMMethodPtrABI = */ true);
+    return new ItaniumCXXABI(CGM, /*UseARMMethodPtrABI=*/true);
 
   case TargetCXXABI::WebAssembly:
     return new WebAssemblyCXXABI(CGM);
 
   case TargetCXXABI::GenericItanium:
     if (CGM.getContext().getTargetInfo().getTriple().getArch()
         == llvm::Triple::le32) {
       // For PNaCl, use ARM-style method pointers so that PNaCl code
       // does not assume anything about the alignment of function
       // pointers.
-      return new ItaniumCXXABI(CGM, /* UseARMMethodPtrABI = */ true,
-                               /* UseARMGuardVarABI = */ false);
+      return new ItaniumCXXABI(CGM, /*UseARMMethodPtrABI=*/true);
     }
     return new ItaniumCXXABI(CGM);
 
   case TargetCXXABI::Microsoft:
     llvm_unreachable("Microsoft ABI is not Itanium-based");
   }
   llvm_unreachable("bad ABI kind");
 }