OS#18874701: Clear valuetype of profiledInstr, when it transforms from LdElemI_A to Ld_A
OS#18874701: Clear valuetype of profiledInstr, when it transforms from LdElemI_A to Ld_A

Otherwise we may end up reading the profiled value type stored in the union (instr->AsProfiledInstr()->u) incorrectly.

Microsoft/ChakraCore,Microsoft/ChakraCore,Microsoft/ChakraCore,Microsoft/ChakraCore,Microsoft/ChakraCore,Microsoft/ChakraCore