Fix issues and re-enable tests disabled in PR #165983 (from PR #165360) (#166147)

1. Fixed test setup to correctly create .so/.dylib files in the build
directory.
Previously, the build was happening in the source directory using the
same
   input parent path.

2. Fixed architecture compatibility check in #166510 .

Co-authored-by: Vassil Vassilev <v.g.vassilev@gmail.com>

Author: SahilPatidar

llvm/unittests/ExecutionEngine/Orc/LibraryResolverTest.cpp

@@ -30,9 +30,7 @@
 using namespace llvm;
 using namespace llvm::orc;
 
-// Disabled due to test setup issue — YAML to shared library creation seems
-// invalid on some build bots. (PR #165360) Not related to code logic.
-#if 0
+#if defined(__APPLE__) || defined(__linux__)
 // TODO: Add COFF (Windows) support for these tests.
 // this facility also works correctly on Windows (COFF),
 // so we should eventually enable and run these tests for that platform as well.
@@ -105,8 +103,9 @@ class LibraryTestEnvironment : public ::testing::Environment {
     if (!sys::fs::exists(InputDirPath))
       return;
 
-    SmallString<128> UniqueDir;
-    sys::path::append(UniqueDir, InputDirPath);
+    SmallString<512> ExecPath(sys::fs::getMainExecutable(nullptr, nullptr));
+    sys::path::remove_filename(ExecPath);
+    SmallString<128> UniqueDir(ExecPath);
     std::error_code EC = sys::fs::createUniqueDirectory(UniqueDir, DirPath);
 
     if (EC)