[libc++][test] re-enable the inference test for clang (#168258)

Fixes #168210
Signed-off-by: Hafidz Muzakky <[email protected]>

Author: huixie90

libcxx/test/std/language.support/support.dynamic/hardware_inference_size.compile.pass.cpp

@@ -7,7 +7,6 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11, c++14
-// UNSUPPORTED: (clang || apple-clang) && stdlib=libc++
 
 #include <new>