feature: Adding debug key for custom igc lib name

This commit adds new debug key which can be used
to override loaded igc libary name.

E.g. IgcLibraryName=my_custom_igc.so

Related-To: NEO-14579

Signed-off-by: Chodor, Jaroslaw <jaroslaw.chodor@intel.com>

shared/source/helpers/compiler_product_helper_base.inl

@@ -316,6 +316,9 @@ bool CompilerProductHelperHw<gfxProduct>::isForceBindlessRequired(const Hardware
 
 template <PRODUCT_FAMILY gfxProduct>
 const char *CompilerProductHelperHw<gfxProduct>::getCustomIgcLibraryName() const {
+    if (debugManager.flags.IgcLibraryName.get() != "unk") {
+        return debugManager.flags.IgcLibraryName.getRef().c_str();
+    }
     return nullptr;
 }