[Local GC] Remove static fields from GC interface (#10566)

* Remove max_generation from GC interface

* [Local GC] Clean up the GC interface by removing all static fields
from it:
  1) gcHeapType is replaced by g_heap_type (EE side) and g_gc_heap_type
     (GC side), each of which is set on initialization. g_heap_type is
     read by the DAC to determine what kind of heap is being used.
  2) maxGeneration is not necessary due to the GC DAC changes.

* Rebase against master

* Comments and cleanup

* Use a heap allocation instead of alloca

* Code review feedback: remove a redundant cast and allocate generation count table once, on first use

* Address code review feedback: cache some calls to GetMaxGeneration

1 files changed, 0 insertions, 6 deletions

diff --git a/src/gc/gcinterface.dac.h b/src/gc/gcinterface.dac.h
index 84c8ffb36a..647101fa1f 100644
--- a/src/gc/gcinterface.dac.h
+++ b/src/gc/gcinterface.dac.h
@@ -18,12 +18,6 @@
 #define MAX_GLOBAL_GC_MECHANISMS_COUNT 6
 #define NUMBERGENERATIONS              4
 
-// TODO(segilles) - Implement this scheme for Server GC
-namespace SVR {
-    class heap_segment;
-    class gc_heap;
-}
-
 // Analogue for the GC heap_segment class, containing information regarding a single
 // heap segment.
 class dac_heap_segment {