[Concurrency] Fix Linux/Windows build issues.

Define `NOMINMAX` and `WIN32_LEAN_AND_MEAN` when including `<Windows.h>`.

Don't export the interface from DLLs.

Make sure we include `<new>` when using placement operator new.

rdar://135380149

Author: al45tair

stdlib/public/Concurrency/CooperativeGlobalExecutor.cpp

@@ -34,6 +34,8 @@
 #ifndef SWIFT_THREADING_NONE
 # include <thread>
 #endif
+#include <new>
+
 #include <errno.h>
 #include "swift/Basic/PriorityQueue.h"
 

stdlib/public/Concurrency/DispatchGlobalExecutor.cpp

@@ -37,6 +37,8 @@
 #include "swift/Runtime/HeapObject.h"
 #include <dispatch/dispatch.h>
 #if defined(_WIN32)
+#define WIN32_LEAN_AND_MEAN
+#define NOMINMAX
 #include <Windows.h>
 #else
 #include <dlfcn.h>

stdlib/public/Concurrency/GlobalExecutor.cpp

@@ -122,14 +122,12 @@ uint64_t swift::swift_task_getJobTaskId(Job *job) {
   }
 }
 
-SWIFT_EXPORT_FROM(swift_Concurrency)
-void *swift_job_alloc(SwiftJob *job, size_t size) {
+extern "C" void *swift_job_alloc(SwiftJob *job, size_t size) {
   auto task = cast<AsyncTask>(reinterpret_cast<Job *>(job));
   return _swift_task_alloc_specific(task, size);
 }
 
-SWIFT_EXPORT_FROM(swift_Concurrency)
-void swift_job_dealloc(SwiftJob *job, void *ptr) {
+extern "C" void swift_job_dealloc(SwiftJob *job, void *ptr) {
   auto task = cast<AsyncTask>(reinterpret_cast<Job *>(job));
   return _swift_task_dealloc_specific(task, ptr);
 }
@@ -142,8 +140,7 @@ bool SerialExecutorRef::isMainExecutor() const {
   return swift_task_isMainExecutor(*this);
 }
 
-SWIFT_EXPORT_FROM(swift_Concurrency)
-bool _swift_task_isMainExecutor_c(SwiftExecutorRef executor) {
+extern "C" bool _swift_task_isMainExecutor_c(SwiftExecutorRef executor) {
   SerialExecutorRef ref = *reinterpret_cast<SerialExecutorRef *>(&executor);
   return swift_task_isMainExecutor(ref);
 }

test/abi/macOS/arm64/concurrency.swift

@@ -343,11 +343,8 @@ Added: _swift_task_invokeSwiftCheckIsolated
 Added: _swift_task_isMainExecutor
 Added: _swift_task_isMainExecutor_hook
 
-Added: __swift_task_isMainExecutor_c
 Added: _swift_task_donateThreadToGlobalExecutorUntil
 Added: _swift_task_donateThreadToGlobalExecutorUntil_hook
-Added: _swift_job_alloc
-Added: _swift_job_dealloc
 
 // Add property descriptors for static properties
 Added: _$sScM21sharedUnownedExecutorScevpZMV

test/abi/macOS/x86_64/concurrency.swift

@@ -344,11 +344,8 @@ Added: _swift_task_invokeSwiftCheckIsolated
 Added: _swift_task_isMainExecutor
 Added: _swift_task_isMainExecutor_hook
 
-Added: __swift_task_isMainExecutor_c
 Added: _swift_task_donateThreadToGlobalExecutorUntil
 Added: _swift_task_donateThreadToGlobalExecutorUntil_hook
-Added: _swift_job_alloc
-Added: _swift_job_dealloc
 
 // Add property descriptors for static properties
 Added: _$sScM21sharedUnownedExecutorScevpZMV