enable TieredPGO by default (#86225)

Author: AndyAyersMS

src/coreclr/inc/clrconfigvalues.h

@@ -614,7 +614,7 @@ CONFIG_DWORD_INFO(INTERNAL_OSR_HighId, W("OSR_HighId"), 10000000, "High end of e
 RETAIL_CONFIG_STRING_INFO(INTERNAL_PGODataPath, W("PGODataPath"), "Read/Write PGO data from/to the indicated file.")
 RETAIL_CONFIG_DWORD_INFO(INTERNAL_ReadPGOData, W("ReadPGOData"), 0, "Read PGO data")
 RETAIL_CONFIG_DWORD_INFO(INTERNAL_WritePGOData, W("WritePGOData"), 0, "Write PGO data")
-RETAIL_CONFIG_DWORD_INFO(EXTERNAL_TieredPGO, W("TieredPGO"), 0, "Instrument Tier0 code and make counts available to Tier1")
+RETAIL_CONFIG_DWORD_INFO(EXTERNAL_TieredPGO, W("TieredPGO"), 1, "Instrument Tier0 code and make counts available to Tier1")
 
 // TieredPGO_InstrumentOnlyHotCode values:
 //