[Autobackout][FuncReg]Revert of change: 212a526

 Enabling URBPartialWritesPass by default

Enabling URBPartialWritesPass by default

Author: pmochock

IGC/common/igc_flags.h

@@ -119,7 +119,7 @@ DECLARE_IGC_REGKEY(bool, UseHDCTypedReadForAllTextures, false, "Setting this to
 DECLARE_IGC_REGKEY(bool, UseHDCTypedReadForAllTypedBuffers,  false, "Setting this to use HDC message rather than sampler ld for buffer read", false)
 DECLARE_IGC_REGKEY(bool, DisableUniformTypedAccess,     false, "Setting this will disable uniform typed access handling", false)
 DECLARE_IGC_REGKEY(bool, DisableURBWriteMerge,          false, "Setting this to 1/true adds a compiler switch to disable URB write merge", false)
-DECLARE_IGC_REGKEY(bool, DisableURBPartialWritesPass,   false, "Disable IGC pass that converts URB partial writes to full-mask writes.", false)
+DECLARE_IGC_REGKEY(bool, DisableURBPartialWritesPass,   true, "Disable IGC pass that converts URB partial writes to full-mask writes.", false)
 DECLARE_IGC_REGKEY(DWORD, SetURBFullWriteGranularity,   0, "Overrides the minimum access granularity for URB full writes.\
                                                             Valid values are 0, 16 and 32, value 0 means use default for the platform.", true)
 DECLARE_IGC_REGKEY(bool, DisableMatchFloor,          false, "Setting this to 1/true adds a compiler switch to disable sub-frc = floor optimization", false)