Use correct node for value in VectorStore

VectorStore properly looks to see if the value being
provided is a scalar and therefore nees to be splatted
to a vector, but then the actual store node generated
uses the original value (whoops!). Simple fix is to
use the (possibly splatted) updated node value.

Also added a missing TraceIL call that will help make it
easier to track what's going on in the traceIlGen output.

Signed-off-by: Mark Stoodley <mstoodle@ca.ibm.com>

compiler/ilgen/OMRIlBuilder.cpp

@@ -660,7 +660,7 @@ OMR::IlBuilder::VectorStore(const char *varName, TR::IlValue *value)
    TR::SymbolReference *symRef = lookupSymbol(varName);
 
    TraceIL("IlBuilder[ %p ]::VectorStore %s %d gets %d\n", this, varName, symRef->getCPIndex(), value->getID());
-   storeNode(symRef, loadValue(value));
+   storeNode(symRef, valueNode);
    }
 
 void