RFR (M) 8233913: Remove implicit conversion from Method* to methodHandle

[Ioi Lam]

Hi Coleen,

I've scanned through all the changes. It looks good. Just a few small nits:


[1] Not sure if you want to handle it in this patch, but MethodData 
initialization is a bit messy:

For MethodData::MethodData() -> MethodData::initialize() -> 
MethodData::init(), I think you can pass in both the THREAD and the 
methodHandle, so you don't need to query the current thread again.This 
can skip two Thread::current() calls for each allocated MethodData.

(But you'd also need no-arg variants of initialize() and init() other 
callers, such as reprofile in jvmciCompilerToVM.cpp .... )

and why do we have MethodData::initialize() and MethodData::init()??

[2] Not a big deal, but should the variables be renamed from mh to m?

void TieredThresholdPolicy::print_counters(const char* prefix, Method* mh) {

void TieredThresholdPolicy::print_event(EventType type, Method* mh, 
Method* imh,
                                         int bci, CompLevel level) {


Thanks
- Ioi