Delete unused LoadMethodCache counter

Summary:
The ones for LoadTypeMethodCache and LoadTypeAttrCache are used, but not this
one.  LoadMethodCache pointers are created in the LIR generator for
LoadMethodCached instructions.

Reviewed By: jbower-fb

Differential Revision: D55765270

fbshipit-source-id: fd7e76d6620d92e96a5e5e6ff2785ad36a3f64ee

cinderx/Jit/hir/builder.cpp

@@ -2197,7 +2197,6 @@ void HIRBuilder::emitLoadMethod(
     Environment& env,
     const jit::BytecodeInstruction& bc_instr) {
   Register* receiver = tc.frame.stack.pop();
-  env.allocateLoadMethodCache();
   Register* result = temps_.AllocateStack();
   Register* method_instance = temps_.AllocateStack();
   tc.emit<LoadMethodCached>(result, receiver, bc_instr.oparg(), tc.frame);

cinderx/Jit/hir/hir.h

@@ -4036,14 +4036,6 @@ class Environment {
     return next_load_type_attr_cache_;
   }
 
-  int allocateLoadMethodCache() {
-    return next_load_method_cache_++;
-  }
-
-  int numLoadMethodCaches() const {
-    return next_load_method_cache_;
-  }
-
   int allocateLoadTypeMethodCache() {
     return next_load_type_method_cache_++;
   }
@@ -4059,7 +4051,6 @@ class Environment {
   ReferenceSet references_;
   int next_register_id_{0};
   int next_load_type_attr_cache_{0};
-  int next_load_method_cache_{0};
   int next_load_type_method_cache_{0};
 };
 

cinderx/PythonLib/test_cinderx/test_cinderjit.py

@@ -997,7 +997,8 @@ def test():
         cinderjit.force_compile(tmp_b.test)
         self.assertTrue(cinderjit.is_jit_compiled(tmp_b.test))
         self.assertTrue(
-            "LoadModuleMethodCached" in cinderjit.get_function_hir_opcode_counts(tmp_b.test)
+            "LoadModuleMethodCached"
+            in cinderjit.get_function_hir_opcode_counts(tmp_b.test)
         )
         # prime the cache
         self.assertEqual(tmp_b.test(), 3)