Enable .bss section in ZEBinary by default

Set AllocateZeroInitializedVarsInBss flag to true by default
to reduce generated binary size.

Author: fda0

IGC/common/igc_flags.h

@@ -697,7 +697,7 @@ DECLARE_IGC_REGKEY(int, JointMatrixLoadStoreOpt, 3, "Selects subgroup (0), or bl
 DECLARE_IGC_REGKEY(bool, EnableVector8LoadStore, false, "Enable Vectorizer to generate 8x32i and 4x64i loads and stores", true)
 DECLARE_IGC_REGKEY(bool, EnableZEBinary, true,  "Force-enable output in ZE binary format. Leave unset for compiler to choose based on current platform's support for ZE binary", true)
 DECLARE_IGC_REGKEY(bool, ExcludeIRFromZEBinary, false, "Exclude IR sections from ZE binary", true)
-DECLARE_IGC_REGKEY(bool, AllocateZeroInitializedVarsInBss, false,  "Allocate zero initialized global variables in .bss section in ZEBinary", true)
+DECLARE_IGC_REGKEY(bool, AllocateZeroInitializedVarsInBss, true,  "Allocate zero initialized global variables in .bss section in ZEBinary", true)
 DECLARE_IGC_REGKEY(DWORD, OverrideOCLMaxParamSize, 0,  "Override the value imposed on the kernel by CL_DEVICE_MAX_PARAMETER_SIZE. Value in bytes, if value==0 no override happens.", true)
 
 DECLARE_IGC_REGKEY(bool, EnableOptReportPrivateMemoryToSLM, false, "[POC] Generate opt report file for moving private memory allocations to SLM.", false)