YJIT code pages refactoring for code GC (#5073)

* New code page allocation logic

* Fix leaked globals

* Fix leaked symbols, yjit asm tests

* Make COUNTED_EXIT take a jit argument, so we can eliminate global ocb

* Remove extra whitespace

* Change block start_pos/end_pos to be pointers instead of uint32_t

* Change branch end_pos and start_pos to end_addr, start_addr

1 files changed, 6 insertions, 10 deletions

diff --git a/yjit_core.h b/yjit_core.h
index e623ed72aa..6cd3ec0095 100644
--- a/yjit_core.h
+++ b/yjit_core.h
@@ -12,11 +12,10 @@
 
 // Scratch registers used by YJIT
 #define REG0 RAX
-#define REG1 RCX
 #define REG0_32 EAX
-#define REG1_32 ECX
-
 #define REG0_8 AL
+#define REG1 RCX
+#define REG1_32 ECX
 
 // Maximum number of temp value types we keep track of
 #define MAX_TEMP_TYPES 8
@@ -193,8 +192,8 @@ typedef struct yjit_branch_entry
     struct yjit_block_version *block;
 
     // Positions where the generated code starts and ends
-    uint32_t start_pos;
-    uint32_t end_pos;
+    uint8_t* start_addr;
+    uint8_t* end_addr;
 
     // Context right after the branch instruction
     ctx_t src_ctx;
@@ -242,8 +241,8 @@ typedef struct yjit_block_version
     ctx_t ctx;
 
     // Positions where the generated code starts and ends
-    uint32_t start_pos;
-    uint32_t end_pos;
+    uint8_t* start_addr;
+    uint8_t* end_addr;
 
     // List of incoming branches (from predecessors)
     branch_array_t incoming;
@@ -259,9 +258,6 @@ typedef struct yjit_block_version
     // block in the system.
     cme_dependency_array_t cme_dependencies;
 
-    // Code page this block lives on
-    VALUE code_page;
-
     // Index one past the last instruction in the iseq
     uint32_t end_idx;