Merge #17073: move-only: PASTE macros to util/macros.h

0d86f4d3da refactor: consolidate PASTE macros (James O'Beirne)

Pull request description:

  Really dumb move-only stolen from #16805. Some of my pull requests also depend on this, so I split it up to not depend on #16805.

ACKs for top commit:
  practicalswift:
    ACK 0d86f4d3da -- diff looks correct
  hebasto:
    ACK 0d86f4d3da, I have reviewed the code and it looks OK, I agree it can be merged.
  promag:
    ACK 0d86f4d3da.

Tree-SHA512: 19208a8cbf83034b1ef25138d8f08d8f32ace7775f654b1597fc4599dd576f0758145f592f161cfdcaaa29d4907ac9aa5553f6f524e2b960205c760605a05901

src/Makefile.am

@@ -209,6 +209,7 @@ BITCOIN_CORE_H = \
   util/error.h \
   util/fees.h \
   util/system.h \
+  util/macros.h \
   util/memory.h \
   util/moneystr.h \
   util/rbf.h \

src/sync.h

@@ -7,6 +7,7 @@
 #define BITCOIN_SYNC_H
 
 #include <threadsafety.h>
+#include <util/macros.h>
 
 #include <condition_variable>
 #include <thread>
@@ -176,9 +177,6 @@ public:
 template<typename MutexArg>
 using DebugLock = UniqueLock<typename std::remove_reference<typename std::remove_pointer<MutexArg>::type>::type>;
 
-#define PASTE(x, y) x ## y
-#define PASTE2(x, y) PASTE(x, y)
-
 #define LOCK(cs) DebugLock<decltype(cs)> PASTE2(criticalblock, __COUNTER__)(cs, #cs, __FILE__, __LINE__)
 #define LOCK2(cs1, cs2)                                               \
     DebugLock<decltype(cs1)> criticalblock1(cs1, #cs1, __FILE__, __LINE__); \

src/util/macros.h

@@ -0,0 +1,11 @@
+// Copyright (c) 2019 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#ifndef BITCOIN_UTIL_MACROS_H
+#define BITCOIN_UTIL_MACROS_H
+
+#define PASTE(x, y) x ## y
+#define PASTE2(x, y) PASTE(x, y)
+
+#endif // BITCOIN_UTIL_MACROS_H