Run ReactorUnitTests.LargeStack on non-Windows targets

Now that we have a workaround for the LargeStack test to run in a normal
amount of time (swiftshader-cl/50710), allow it to run again on all
platforms.

Bug: b/174031014
Change-Id: I034defd1ea136cd14cfd25404b717798c37a409a
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/50728
Kokoro-Result: kokoro <noreply+kokoro@google.com>
Tested-by: Antonio Maiorano <amaiorano@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>
diff --git a/tests/ReactorUnitTests/ReactorUnitTests.cpp b/tests/ReactorUnitTests/ReactorUnitTests.cpp
index fbe61ec..108a976 100644
--- a/tests/ReactorUnitTests/ReactorUnitTests.cpp
+++ b/tests/ReactorUnitTests/ReactorUnitTests.cpp
@@ -1258,7 +1258,6 @@
 // required pages. See https://docs.microsoft.com/en-us/windows/win32/devnotes/-win32-chkstk.
 TEST(ReactorUnitTests, LargeStack)
 {
-#if defined(_WIN32)
 	// An empirically large enough value to access outside the guard pages
 	constexpr int ArrayByteSize = 24 * 1024;
 	constexpr int ArraySize = ArrayByteSize / sizeof(int32_t);
@@ -1301,7 +1300,6 @@
 	{
 		EXPECT_EQ(v[i], i);
 	}
-#endif
 }
 
 TEST(ReactorUnitTests, Call)