8366028: MethodType::fromMethodDescriptorString should not throw UnsupportedOperationException for invalid descriptors

[liach]

A previous cleanup #14642 accidentally omitted the fact that an Array.newInstance call in BytecodeDescriptor::parseSig is intended to propagate IllegalArgumentException to MethodType::fromMethodDescriptorString. This bug is discovered in a recent cleanup for BytecodeDescriptor in #24978.

Instead of restoring the original newInstance call, this patch catches the UnsupportedOperationException thrown by Class::arrayType to because the cause IAE thrown by newInstance has no message at all. The existing reporting system in BytecodeDescriptor::parseMethod includes the whole malformed descriptor string in the error message, which can be triggered by returning null in parseSig.

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• JDK-8366028: MethodType::fromMethodDescriptorString should not throw UnsupportedOperationException for invalid descriptors (Bug - P4)

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