Default gcAllowVeryLargeObjects to true (#8853)

* Default gcAllowVeryLargeObjects to true

* Update tests for gcAllowVeryLargeObjects

These 2 tests appear to rely on gcAllowVeryLargeObjects being false in that they expect an exception to be thrown when allocating a very large array.

Increase the number of array elements so that an OutOfMemoryException is always thown no matter what value gcAllowVeryLargeObjects has. 81*98*58*36*74*4 is 4906065024 which is larger than 2^32, the theoretical array length limit.

Author: mikedn

src/inc/clrconfigvalues.h

@@ -338,7 +338,7 @@ RETAIL_CONFIG_DWORD_INFO_DIRECT_ACCESS(UNSUPPORTED_GCprnLvl, W("GCprnLvl"), "Spe
 RETAIL_CONFIG_DWORD_INFO(UNSUPPORTED_GCRetainVM, W("GCRetainVM"), 0, "When set we put the segments that should be deleted on a standby list (instead of releasing them back to the OS) which will be considered to satisfy new segment requests (note that the same thing can be specified via API which is the supported way)")
 RETAIL_CONFIG_DWORD_INFO_DIRECT_ACCESS(UNSUPPORTED_GCSegmentSize, W("GCSegmentSize"), "Specifies the managed heap segment size")
 RETAIL_CONFIG_DWORD_INFO_DIRECT_ACCESS(UNSUPPORTED_GCLOHCompact, W("GCLOHCompact"), "Specifies the LOH compaction mode")
-RETAIL_CONFIG_DWORD_INFO(EXTERNAL_gcAllowVeryLargeObjects, W("gcAllowVeryLargeObjects"), 0, "allow allocation of 2GB+ objects on GC heap")
+RETAIL_CONFIG_DWORD_INFO(EXTERNAL_gcAllowVeryLargeObjects, W("gcAllowVeryLargeObjects"), 1, "allow allocation of 2GB+ objects on GC heap")
 RETAIL_CONFIG_DWORD_INFO_EX(EXTERNAL_GCStress, W("GCStress"), 0, "trigger GCs at regular intervals", CLRConfig::REGUTIL_default)
 CONFIG_DWORD_INFO_EX(INTERNAL_GcStressOnDirectCalls, W("GcStressOnDirectCalls"), 0, "whether to trigger a GC on direct calls", CLRConfig::REGUTIL_default)
 RETAIL_CONFIG_DWORD_INFO(EXTERNAL_GCStressStart, W("GCStressStart"), 0, "start GCStress after N stress GCs have been attempted")

tests/src/JIT/Regression/VS-ia64-JIT/V2.0-RTM/b539509/b539509.cs

@@ -133,7 +133,7 @@ public static ulong Static1(TF param1)
         do
         {
             bool[, , , ,][,] local8 = (new bool[81u, 98u, ((uint)(58.0f)), ((uint)(36.0f)),
-                74u][,]);
+                74u*4u][,]);
             while ((((uint)(local5)) != 4u))
             {
                 if (Convert.ToBoolean((local5 + local5)))

tests/src/JIT/jit64/regress/vsw/539509/test1.cs

@@ -162,7 +162,7 @@ public static ulong Static1(TF param1)
         do
         {
             bool[,,,,][,] local8 = (new bool[81u, 98u, ((uint)(58.0f)), ((uint)(36.0f)),
-                74u][,]);
+                74u*4u][,]);
             while ((((uint)(local5)) != 4u))
             {
                 if (Convert.ToBoolean((local5 + local5)))