Remove experimental fast-codegen. We are no longer working on this

src/SConscript

Index: src/SConscript
===================================================================
--- src/SConscript	(revision 5256)
+++ src/SConscript	(working copy)
@@ -118,7 +118,6 @@
     zone.cc
     """),
   'arch:arm': Split("""
-    fast-codegen.cc
     jump-target-light.cc
     virtual-frame-light.cc
     arm/builtins-arm.cc
@@ -127,7 +126,6 @@
     arm/cpu-arm.cc
     arm/debug-arm.cc
     arm/disasm-arm.cc
-    arm/fast-codegen-arm.cc
     arm/frames-arm.cc
     arm/full-codegen-arm.cc
     arm/ic-arm.cc
@@ -140,7 +138,6 @@
     arm/assembler-arm.cc
     """),
   'arch:mips': Split("""
-    fast-codegen.cc
     mips/assembler-mips.cc
     mips/builtins-mips.cc
     mips/codegen-mips.cc
@@ -148,7 +145,6 @@
     mips/cpu-mips.cc
     mips/debug-mips.cc
     mips/disasm-mips.cc
-    mips/fast-codegen-mips.cc
     mips/full-codegen-mips.cc
     mips/frames-mips.cc
     mips/ic-mips.cc
@@ -167,7 +163,6 @@
     ia32/cpu-ia32.cc
     ia32/debug-ia32.cc
     ia32/disasm-ia32.cc
-    ia32/fast-codegen-ia32.cc
     ia32/frames-ia32.cc
     ia32/full-codegen-ia32.cc
     ia32/ic-ia32.cc
@@ -179,7 +174,6 @@
     ia32/virtual-frame-ia32.cc
     """),
   'arch:x64': Split("""
-    fast-codegen.cc
     jump-target-heavy.cc
     virtual-frame-heavy.cc
     x64/assembler-x64.cc
@@ -188,7 +182,6 @@
     x64/cpu-x64.cc
     x64/debug-x64.cc
     x64/disasm-x64.cc
-    x64/fast-codegen-x64.cc
     x64/frames-x64.cc
     x64/full-codegen-x64.cc
     x64/ic-x64.cc