* configure.ac: Added option --enable-replacement.

* configure.ac: Added option --enable-replacement.

* src/vm/jit/Makefile.am: Compile replace.c only for
ENABLE_REPLACEMENT.

* src/vm/jit/replace.h: Define empty macros unless ENABLE_REPLACEMENT.

* src/vm/jit/powerpc/emit.c: Enclosed replacement-specific code in
#if ENABLE_REPLACEMENT.
* src/vm/jit/powerpc/md.c: Likewise.
* src/vm/jit/powerpc/asmpart.S: Likewise.
* src/vm/jit/codegen-common.h: Likewise.
* src/vm/jit/sparc64/emit.c: Likewise.
* src/vm/jit/sparc64/md.c: Likewise.
* src/vm/jit/alpha/emit.c: Likewise.
* src/vm/jit/alpha/md.c: Likewise.
* src/vm/jit/alpha/asmpart.S: Likewise.
* src/vm/jit/code.c: Likewise.
* src/vm/jit/code.h: Likewise.
* src/vm/jit/tools/genoffsets.c: Likewise.
* src/vm/jit/show.c: Likewise.
* src/vm/jit/mips/emit.c: Likewise.
* src/vm/jit/mips/md.c: Likewise.
* src/vm/jit/mips/asmpart.S: Likewise.
* src/vm/jit/powerpc64/md.c: Likewise.
* src/vm/jit/powerpc64/asmpart.S: Likewise.
* src/vm/jit/i386/emit.c: Likewise.
* src/vm/jit/i386/md.c: Likewise.
* src/vm/jit/i386/asmpart.S: Likewise.
* src/vm/jit/asmpart.h: Likewise.
* src/vm/jit/x86_64/emit.c: Likewise.
* src/vm/jit/x86_64/md.c: Likewise.
* src/vm/jit/x86_64/asmpart.S: Likewise.
* src/vm/jit/codegen-common.c: Likewise.
* src/vm/jit/jit.h: Likewise.