Alignment error and possible read past float storage in stackValueCollection.cpp on sparcv9

src/share/vm/runtime/stackValueCollection.cpp

Has code that looks like:

   86 void StackValueCollection::set_float_at(int slot, jfloat value) {
   87 at(slot)->set_int(*(intptr_t*)(&value));
   88 }

The &value is a float*, and can be aligned on any 32 bit boundary, it points to a 32bit float.
Casting to a intptr_t* which is a long* on sparcv9, then dereferencing it means that we run the
risk of a SIGBUS when compiled with -xmemalign=8s, but more importantly we are accessing
32bits beyond the end of this float object.

See suggested fix.
###@###.### 2005-03-10 22:45:31 GMT

This bug affects the following tests:

    com/sun/jdi/FetchLocals.java
    com/sun/jdi/GetSetLocalTest.java
    com/sun/jdi/SparcToSparcv9Test.sh
    nsk/jdwp/StackFrame/SetValues/setvalues001
    nsk/jvmdi/SetLocalVariable/setlocal001
    nsk/jvmti/SetLocalVariable/setlocal001
    nsk/jvmti/scenarios/capability/CM01/cm01t011

###@###.### 2005-03-18 18:37:42 GMT