public default boolean isExternalBlock() {
		return EXTERNAL_BLOCK_NAME.equals(getName());
	}
Returns true if this is a reserved EXTERNAL memory block based upon its name
(see {@link MemoryBlock#EXTERNAL_BLOCK_NAME}).  Checks for individual addresses may be done
using {@link Memory#isExternalBlockAddress(Address)}.
<p>
Note that EXTERNAL blocks always resides within a memory space and never within the artifial
{@link AddressSpace#EXTERNAL_SPACE} which is not a memory space.  This can be a source of confusion.
An EXTERNAL memory block exists to facilitate relocation processing for some external
symbols which require a real memory address. 

@return true if this is a reserved EXTERNAL memory block
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/model/mem/MemoryBlock.java