[ORC] Skip reoptimization test on COFF-ARM64.

Try to skip tests to prevent build bot failure:
https://lab.llvm.org/buildbot/#/builders/161/builds/2692

Author: sunho

llvm/unittests/ExecutionEngine/Orc/JITLinkRedirectionManagerTest.cpp

@@ -38,6 +38,11 @@ class JITLinkRedirectionManagerTest : public testing::Test {
       GTEST_SKIP();
     }
 
+    // COFF-ARM64 is not supported yet
+    auto Triple = JTMB->getTargetTriple();
+    if (Triple.isOSBinFormatCOFF() && Triple.isAArch64())
+      GTEST_SKIP();
+
     ES = std::make_unique<ExecutionSession>(
         std::make_unique<UnsupportedExecutorProcessControl>(
             nullptr, nullptr, JTMB->getTargetTriple().getTriple()));

llvm/unittests/ExecutionEngine/Orc/ReOptimizeLayerTest.cpp

@@ -38,6 +38,11 @@ class ReOptimizeLayerTest : public testing::Test {
       GTEST_SKIP();
     }
 
+    // COFF-ARM64 is not supported yet
+    auto Triple = JTMB->getTargetTriple();
+    if (Triple.isOSBinFormatCOFF() && Triple.isAArch64())
+      GTEST_SKIP();
+
     auto EPC = SelfExecutorProcessControl::Create();
     if (!EPC) {
       consumeError(EPC.takeError());