Fix #1955 clang-tidy warning misc-macro-parentheses

clang-tidy gives warning "macro argument should be enclosed in
parentheses" to macro ZR_, the "first" parameter.

src/google/protobuf/api.pb.cc

@@ -1005,7 +1005,7 @@ void Method::Clear() {
 #endif
 
 #define ZR_(first, last) do {\
-  ::memset(&first, 0,\
+  ::memset(&(first), 0,\
            ZR_HELPER_(last) - ZR_HELPER_(first) + sizeof(last));\
 } while (0)
 

src/google/protobuf/compiler/cpp/cpp_message.cc

@@ -2419,7 +2419,7 @@ GenerateClear(io::Printer* printer) {
       "  &reinterpret_cast<$classname$*>(16)->f)\n"
       "#endif\n\n"
       "#define ZR_(first, last) do {\\\n"
-      "  ::memset(&first, 0,\\\n"
+      "  ::memset(&(first), 0,\\\n"
       "           ZR_HELPER_(last) - ZR_HELPER_(first) + sizeof(last));\\\n"
       "} while (0)\n\n";
   for (int i = 0; i < runs_of_fields_.size(); i++) {

src/google/protobuf/descriptor.pb.cc

@@ -2533,7 +2533,7 @@ void DescriptorProto_ExtensionRange::Clear() {
 #endif
 
 #define ZR_(first, last) do {\
-  ::memset(&first, 0,\
+  ::memset(&(first), 0,\
            ZR_HELPER_(last) - ZR_HELPER_(first) + sizeof(last));\
 } while (0)
 
@@ -2836,7 +2836,7 @@ void DescriptorProto_ReservedRange::Clear() {
 #endif
 
 #define ZR_(first, last) do {\
-  ::memset(&first, 0,\
+  ::memset(&(first), 0,\
            ZR_HELPER_(last) - ZR_HELPER_(first) + sizeof(last));\
 } while (0)
 
@@ -7347,7 +7347,7 @@ void MethodDescriptorProto::Clear() {
 #endif
 
 #define ZR_(first, last) do {\
-  ::memset(&first, 0,\
+  ::memset(&(first), 0,\
            ZR_HELPER_(last) - ZR_HELPER_(first) + sizeof(last));\
 } while (0)
 
@@ -8163,7 +8163,7 @@ void FileOptions::Clear() {
 #endif
 
 #define ZR_(first, last) do {\
-  ::memset(&first, 0,\
+  ::memset(&(first), 0,\
            ZR_HELPER_(last) - ZR_HELPER_(first) + sizeof(last));\
 } while (0)
 
@@ -9570,7 +9570,7 @@ void MessageOptions::Clear() {
 #endif
 
 #define ZR_(first, last) do {\
-  ::memset(&first, 0,\
+  ::memset(&(first), 0,\
            ZR_HELPER_(last) - ZR_HELPER_(first) + sizeof(last));\
 } while (0)
 
@@ -10183,7 +10183,7 @@ void FieldOptions::Clear() {
 #endif
 
 #define ZR_(first, last) do {\
-  ::memset(&first, 0,\
+  ::memset(&(first), 0,\
            ZR_HELPER_(last) - ZR_HELPER_(first) + sizeof(last));\
 } while (0)
 
@@ -11177,7 +11177,7 @@ void EnumOptions::Clear() {
 #endif
 
 #define ZR_(first, last) do {\
-  ::memset(&first, 0,\
+  ::memset(&(first), 0,\
            ZR_HELPER_(last) - ZR_HELPER_(first) + sizeof(last));\
 } while (0)
 
@@ -13033,7 +13033,7 @@ void UninterpretedOption::Clear() {
 #endif
 
 #define ZR_(first, last) do {\
-  ::memset(&first, 0,\
+  ::memset(&(first), 0,\
            ZR_HELPER_(last) - ZR_HELPER_(first) + sizeof(last));\
 } while (0)
 
@@ -14918,7 +14918,7 @@ void GeneratedCodeInfo_Annotation::Clear() {
 #endif
 
 #define ZR_(first, last) do {\
-  ::memset(&first, 0,\
+  ::memset(&(first), 0,\
            ZR_HELPER_(last) - ZR_HELPER_(first) + sizeof(last));\
 } while (0)
 

src/google/protobuf/duration.pb.cc

@@ -185,7 +185,7 @@ void Duration::Clear() {
 #endif
 
 #define ZR_(first, last) do {\
-  ::memset(&first, 0,\
+  ::memset(&(first), 0,\
            ZR_HELPER_(last) - ZR_HELPER_(first) + sizeof(last));\
 } while (0)
 

src/google/protobuf/timestamp.pb.cc

@@ -199,7 +199,7 @@ void Timestamp::Clear() {
 #endif
 
 #define ZR_(first, last) do {\
-  ::memset(&first, 0,\
+  ::memset(&(first), 0,\
            ZR_HELPER_(last) - ZR_HELPER_(first) + sizeof(last));\
 } while (0)
 

src/google/protobuf/type.pb.cc

@@ -1125,7 +1125,7 @@ void Field::Clear() {
 #endif
 
 #define ZR_(first, last) do {\
-  ::memset(&first, 0,\
+  ::memset(&(first), 0,\
            ZR_HELPER_(last) - ZR_HELPER_(first) + sizeof(last));\
 } while (0)