public void setSwiftDir(File swiftDir) {
		this.swiftDir = swiftDir;
	}
Sets the Swift directory
<p>
If the Swift directory is on the PATH environment variable, it is fine to set this to 
null

@param swiftDir The Swift directory
Ghidra/Features/SwiftDemangler/src/main/java/ghidra/app/util/demangler/swift/SwiftDemanglerOptions.java