Updated libjit to 0.0.4.

Changes:
	* Pluggable object models.
	* Problems with "gen-apply" on Win32 systems.
	* Optimize "if true goto" into "goto".
	* Peephole optimization on branches.
	* Adjust ARM codegen macros to support branch elimination instructions.
	* Redesign exception handling to use "setjmp" everywhere.
	* Remove C++ code from "libjit.so" so that it is a pure C library.
	* Use computed goto's in the interpreter if the compiler supports them.
	* Don't allow conditional branches to jump out of exception contexts.
	* Block movement to allow initialization code to be moved to the start
	  of a function, or loop condition code to be moved to the end.
	* Rewrite the exception region routines to make them easier to use.
	* Add the "gen-sel" program, for creating instruction selectors.
	* Write instruction selectors for x86 and ARM (only x86 is enabled).
	* Portability fixes for ARM, PPC, Alpha, IA64, and amd64.
	* Clarify the description of LLVM, at the request of LLVM's author.
	* Deferred argument popping after function calls.
	* Add "--enable-interpreter" to force the interpreter to be used.
	* Implement a simple global register allocator based on usage counts.
	* Recognise increment and decrement idioms.
	* Align cache flushes properly (Miroslaw Dobrzanski-Neumann).
	* Querying of x86 cpuid where necessary.
	* Add a constant pool for ARM, to make constant loads more efficient.
	* Handle register pairs for 64-bit values properly.
	* Support for parameter areas on the stack, to reduce push/pop overhead.
	* Avoid unnecessary register spills if a value won't be used again.
	* Implement tail calls from a function to itself.
	* Optimize x86 prologs and epilogs to avoid doing unnecessry work.
	* Centralise the code that handles parameter passing.
	* Support for parallel builds.

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