[ORC][unittests] Remove hard coded 16k page size (#127115)

Fixes a couple hard coded 16k values which is being used as the page
size. Replaces the hard coded value with the system's page size. This
fixes #116753 on an Ampere Altra Q64-22

CC @lhames

(cherry picked from commit 415607e)

Author: RossComputerGuy

llvm/unittests/ExecutionEngine/Orc/JITLinkRedirectionManagerTest.cpp

@@ -48,12 +48,18 @@ class JITLinkRedirectionManagerTest : public testing::Test {
     if (Triple.isPPC())
       GTEST_SKIP();
 
+    auto PageSize = sys::Process::getPageSize();
+    if (!PageSize) {
+      consumeError(PageSize.takeError());
+      GTEST_SKIP();
+    }
+
     ES = std::make_unique<ExecutionSession>(
         std::make_unique<UnsupportedExecutorProcessControl>(
-            nullptr, nullptr, JTMB->getTargetTriple().getTriple()));
+            nullptr, nullptr, JTMB->getTargetTriple().getTriple(), *PageSize));
     JD = &ES->createBareJITDylib("main");
     ObjLinkingLayer = std::make_unique<ObjectLinkingLayer>(
-        *ES, std::make_unique<InProcessMemoryManager>(16384));
+        *ES, std::make_unique<InProcessMemoryManager>(*PageSize));
     DL = std::make_unique<DataLayout>(std::move(*DLOrErr));
   }
   JITDylib *JD{nullptr};

llvm/unittests/ExecutionEngine/Orc/ReOptimizeLayerTest.cpp

@@ -66,10 +66,17 @@ class ReOptimizeLayerTest : public testing::Test {
       consumeError(DLOrErr.takeError());
       GTEST_SKIP();
     }
+
+    auto PageSize = sys::Process::getPageSize();
+    if (!PageSize) {
+      consumeError(PageSize.takeError());
+      GTEST_SKIP();
+    }
+
     ES = std::make_unique<ExecutionSession>(std::move(*EPC));
     JD = &ES->createBareJITDylib("main");
     ObjLinkingLayer = std::make_unique<ObjectLinkingLayer>(
-        *ES, std::make_unique<InProcessMemoryManager>(16384));
+        *ES, std::make_unique<InProcessMemoryManager>(*PageSize));
     DL = std::make_unique<DataLayout>(std::move(*DLOrErr));
 
     auto TM = JTMB->createTargetMachine();