[ORC] Switch from initializer lists to named arguments to work around MSVC.

MSVC doesn't like some of the initializer list uses in 0e940d5.
Switch to named arguments to work around this.

Author: lhames

llvm/lib/ExecutionEngine/Orc/TPCIndirectionUtils.cpp

@@ -126,9 +126,10 @@ Error TPCTrampolinePool::grow() {
       static_cast<sys::Memory::ProtectionFlags>(sys::Memory::MF_READ |
                                                 sys::Memory::MF_EXEC);
   auto PageSize = TPC.getPageSize();
-  auto Alloc = TPC.getMemMgr().allocate(
-      {{TrampolinePagePermissions,
-        {PageSize, static_cast<size_t>(PageSize), 0}}});
+  jitlink::JITLinkMemoryManager::SegmentsRequestMap Request;
+  Request[TrampolinePagePermissions] = {PageSize, static_cast<size_t>(PageSize),
+                                        0};
+  auto Alloc = TPC.getMemMgr().allocate(Request);
 
   if (!Alloc)
     return Alloc.takeError();
@@ -310,9 +311,10 @@ TPCIndirectionUtils::writeResolverBlock(JITTargetAddress ReentryFnAddr,
                                                 sys::Memory::MF_EXEC);
   auto ResolverSize = ABI->getResolverCodeSize();
 
-  auto Alloc = TPC.getMemMgr().allocate(
-      {{ResolverBlockPermissions,
-        {TPC.getPageSize(), static_cast<size_t>(ResolverSize), 0}}});
+  jitlink::JITLinkMemoryManager::SegmentsRequestMap Request;
+  Request[ResolverBlockPermissions] = {TPC.getPageSize(),
+                                       static_cast<size_t>(ResolverSize), 0};
+  auto Alloc = TPC.getMemMgr().allocate(Request);
   if (!Alloc)
     return Alloc.takeError();
 
@@ -379,10 +381,11 @@ TPCIndirectionUtils::getIndirectStubs(unsigned NumStubs) {
         static_cast<sys::Memory::ProtectionFlags>(sys::Memory::MF_READ |
                                                   sys::Memory::MF_WRITE);
 
-    auto Alloc = TPC.getMemMgr().allocate(
-        {{StubPagePermissions, {PageSize, static_cast<size_t>(StubBytes), 0}},
-         {PointerPagePermissions, {PageSize, 0, PointerBytes}}});
-
+    jitlink::JITLinkMemoryManager::SegmentsRequestMap Request;
+    Request[StubPagePermissions] = {PageSize, static_cast<size_t>(StubBytes),
+                                    0};
+    Request[PointerPagePermissions] = {PageSize, 0, PointerBytes};
+    auto Alloc = TPC.getMemMgr().allocate(Request);
     if (!Alloc)
       return Alloc.takeError();