ZJIT: Add new CompileError::NativeStackTooLarge

This helps distinguish an OutOfMemory (intended to be for running out of
code space) from a native frame needing too much stack space. On
protoboeuf, for example:

    Top-2 compile error reasons (100.0% of total 5,798,926):
               out_of_memory: 3,074,342 (53.0%)
      native_stack_too_large: 2,724,584 (47.0%)

Author: tekknolagi

zjit/src/backend/arm64/mod.rs

@@ -1629,7 +1629,7 @@ impl Assembler {
 
         let total_stack_slots = asm.stack_base_idx + num_stack_slots;
         if total_stack_slots > Self::MAX_FRAME_STACK_SLOTS {
-            return Err(CompileError::OutOfMemory);
+            return Err(CompileError::NativeStackTooLarge);
         }
 
         // Dump vreg-to-physical-register mapping if requested

zjit/src/backend/x86_64/mod.rs

@@ -1164,7 +1164,7 @@ impl Assembler {
 
         let total_stack_slots = asm.stack_base_idx + num_stack_slots;
         if total_stack_slots > Self::MAX_FRAME_STACK_SLOTS {
-            return Err(CompileError::OutOfMemory);
+            return Err(CompileError::NativeStackTooLarge);
         }
 
         // Dump vreg-to-physical-register mapping if requested

zjit/src/stats.rs

@@ -329,6 +329,7 @@ make_counters! {
     // compile_error_: Compile error reasons
     compile_error_iseq_version_limit_reached,
     compile_error_iseq_stack_too_large,
+    compile_error_native_stack_too_large,
     compile_error_exception_handler,
     compile_error_out_of_memory,
     compile_error_label_linking_failure,
@@ -500,6 +501,7 @@ pub fn send_fallback_counter_ptr_for_opcode(opcode: u32) -> *mut u64 {
 pub enum CompileError {
     IseqVersionLimitReached,
     IseqStackTooLarge,
+    NativeStackTooLarge,
     ExceptionHandler,
     OutOfMemory,
     ParseError(ParseError),
@@ -518,6 +520,7 @@ pub fn exit_counter_for_compile_error(compile_error: &CompileError) -> Counter {
     match compile_error {
         IseqVersionLimitReached => compile_error_iseq_version_limit_reached,
         IseqStackTooLarge       => compile_error_iseq_stack_too_large,
+        NativeStackTooLarge     => compile_error_native_stack_too_large,
         ExceptionHandler        => compile_error_exception_handler,
         OutOfMemory             => compile_error_out_of_memory,
         LabelLinkingFailure     => compile_error_label_linking_failure,