[SYCL] Don't load all fallback spirv when launching from SPIRV file (#11734)

Currently, sycl-post-link tool scans user's device image to detect any
undefined function call to items in fallback spirv devicelibs and create
a property in final executable to tell which fallback devicelibs are
really needed. SYCL runtime will load required fallback spirv libs
according to this property.
However, if "SYCL_USE_KERNEL_SPIRV" is used, the kernel is launched from
spv file and sycl-post-link tool is not involved to scan and generate
the property. Previously, we just load and link all fallback spv files
and underlying runtime will remove them when they don't need those code.
However, we received a lot of complains about seeing a lot of
unnecessary code from underlying runtime. So, this PR is to avoid
loading this unnecessary code.
If anyone uses clang++ driver to generate spv file, this file won't
depend on any functions from fallback spv since device code has to be
linked with wrapper .obj to involve any functions from fallback spv.

Author: jinge90

sycl/source/detail/program_manager/program_manager.cpp

@@ -1522,16 +1522,13 @@ void ProgramManager::flushSpecConstants(const program_impl &Prg,
   Prg.flush_spec_constants(*Img, NativePrg);
 }
 
-// If the kernel is loaded from spv file, it may not include DeviceLib require
-// mask, sycl runtime won't know which fallback device libraries are needed. In
-// such case, the safest way is to load all fallback device libraries.
 uint32_t ProgramManager::getDeviceLibReqMask(const RTDeviceBinaryImage &Img) {
   const RTDeviceBinaryImage::PropertyRange &DLMRange =
       Img.getDeviceLibReqMask();
   if (DLMRange.isAvailable())
     return DeviceBinaryProperty(*(DLMRange.begin())).asUint32();
   else
-    return 0xFFFFFFFF;
+    return 0x0;
 }
 
 const KernelArgMask *