[mini] arm64: Add some more space for tailcall opcodes (#102092)

It looks like in some circumstances 255 bytes isn't enough.
255 is encoded in cpu-arm64.mdesc that only uses a uint8 for the
max instruction length.

Fixes #102086

Author: lambdageek

src/mono/mono/mini/mini-arm64.c

@@ -5398,6 +5398,13 @@ mono_arch_output_basic_block (MonoCompile *cfg, MonoBasicBlock *bb)
 			g_assert (!cfg->method->save_lmf);
 
 			max_len += call->stack_usage / sizeof (target_mgreg_t) * ins_get_size (OP_TAILCALL_PARAMETER);
+			// HACK: In cpu-arm64.mdesc the tailcall opcodes have a len of 255, which is
+			// arbitrary, but it's the max uint8 value.  It looks like in some
+			// circumstances we need more space than that.
+			//
+			// Add some more space to acount for mono_arm_emit_destroy_frame and
+			// emit_load_regset, below
+			max_len += 64;
 			while (G_UNLIKELY (offset + max_len > cfg->code_size)) {
 				cfg->code_size *= 2;
 				cfg->native_code = (unsigned char *)mono_realloc_native_code (cfg);