Revert "[Autobackout][FuncReg]Revert of change: bc1ecf3"

This reverts commit a3e06b3.

Author: pszymich

IGC/common/igc_flags.h

@@ -521,7 +521,7 @@ DECLARE_IGC_REGKEY_ENUM(TgmLoadCacheControlOverride, 0, "Overrides cache-control
 DECLARE_IGC_REGKEY_ENUM(TgmStoreCacheControlOverride, 0, "Overrides cache-control options for non-intrinsic LSC tgm stores.", LSC_CACHE_CTRL_OPTIONS, true)
 DECLARE_IGC_REGKEY(bool, LscForceSpillNonStackcall, false, "Non-stack call kernels that spill will use LSC on DG2+", true)
 
-DECLARE_IGC_REGKEY(bool, EnableGlobalStateBuffer,              false, "This key allows stack calls to read implicit args from side buffer. It also emits a relocatable add in VISA.", true)
+DECLARE_IGC_REGKEY(bool, EnableGlobalStateBuffer,       true, "This key allows stack calls to read implicit args from side buffer. It also emits a relocatable add in VISA.", true)
 DECLARE_IGC_REGKEY(bool, LateInlineUnmaskedFunc,        false, "Postpone inlining of Unmasked functions till end of CG to avoid code movement inside/outside of unmasked region", false)
 DECLARE_IGC_REGKEY(bool, ForceFormatConversionDG2Plus,  false,
     "Forces SW image format conversion for R10G10B10A2_UNORM, R11G11B10_FLOAT, R10G10B10A2_UINT image formats on DG2+ platforms", true)