Remove deprecated methods

[Guille Polito]

Several methods call self deprecated and should be removed.

objectArg: offset
	"Like #stackObjectValue: but access method arguments left-to-right"
	"Obsolete; was never used; replaced with methodReturnFloat: in the VirtualMachine struct."
	| oop |
	self deprecated.
	oop := self methodArg: offset.
	(self isImmediate: oop) ifTrue: [self primitiveFail. ^ nil].
	^oop