I'm not sure I understand what does compiling a javam have to do with replacing a vm with a compiler? The jvm has really good garbage control and a good jit com

I'm not sure I understand what does compiling a javam have to do with replacing a vm with a compiler? The jvm has really good garbage control and a good jit compiler. LLVM has some of the stuff needed for writing a jit compiler for a vm. I'm not sure whether a compiler for a garbage collected language will be faster then a jit compiler.