Temporarily never speculate.

I have a whole bunch of mechanical changes to allow speculation, but
I think our pre-existing speculation rules end up hurting the macrobenchmarks.
I'd like to get those in and then separately work on making in beneficial.

src/analysis/type_analysis.cpp

@@ -112,6 +112,9 @@ private:
         assert(old_type);
         assert(speculation != TypeAnalysis::NONE);
 
+        // TODO: reenable this
+        return old_type;
+
         if (speculated_cls != NULL && speculated_cls->is_constant) {
             ConcreteCompilerType* speculated_type = unboxedType(typeFromClass(speculated_cls));
             if (VERBOSITY() >= 2) {

test/tests/deopt_generator_tests.py

 # skip-if: '-O' in EXTRA_JIT_ARGS
+# expected: statfail
 # statcheck: 4 <= noninit_count('num_deopt') < 50
 # statcheck: 1 <= stats["num_osr_exits"] <= 2
 

test/tests/deopt_namescope_tests.py

 # skip-if: '-O' in EXTRA_JIT_ARGS
+# expected: statfail
 # statcheck: 4 <= noninit_count('num_deopt') < 50
 # statcheck: 1 <= stats["num_osr_exits"] <= 2
 

test/tests/deopt_tests.py

 # skip-if: '-O' in EXTRA_JIT_ARGS
+# expected: statfail
 # statcheck: 4 <= noninit_count('num_deopt') < 50
 # statcheck: 1 <= stats["num_osr_exits"] <= 2