Basic infrastructure for fast two-pass compilation. A CFG is...

src/SConscript

Index: src/SConscript
===================================================================
--- src/SConscript	(revision 2595)
+++ src/SConscript	(working copy)
@@ -36,25 +36,26 @@
 SOURCES = {
   'all': [
     'accessors.cc', 'allocation.cc', 'api.cc', 'assembler.cc', 'ast.cc',
-    'bootstrapper.cc', 'builtins.cc', 'checks.cc', 'code-stubs.cc',
-    'codegen.cc', 'compilation-cache.cc', 'compiler.cc', 'contexts.cc',
-    'conversions.cc', 'counters.cc', 'dateparser.cc', 'debug.cc',
-    'debug-agent.cc', 'disassembler.cc', 'execution.cc', 'factory.cc',
-    'flags.cc', 'frame-element.cc', 'frames.cc', 'func-name-inferrer.cc',
-    'global-handles.cc', 'handles.cc', 'hashmap.cc',
-    'heap.cc', 'ic.cc', 'interpreter-irregexp.cc', 'jsregexp.cc',
-    'jump-target.cc', 'log.cc', 'log-utils.cc', 'mark-compact.cc', 'messages.cc',
-    'objects.cc', 'oprofile-agent.cc', 'parser.cc', 'property.cc',
-    'regexp-macro-assembler.cc', 'regexp-macro-assembler-irregexp.cc',
-    'regexp-stack.cc', 'register-allocator.cc', 'rewriter.cc', 'runtime.cc',
-    'scanner.cc', 'scopeinfo.cc', 'scopes.cc', 'serialize.cc',
-    'snapshot-common.cc', 'spaces.cc', 'string-stream.cc', 'stub-cache.cc',
-    'token.cc', 'top.cc', 'unicode.cc', 'usage-analyzer.cc', 'utils.cc',
-    'v8-counters.cc', 'v8.cc', 'v8threads.cc', 'variables.cc', 'version.cc',
+    'bootstrapper.cc', 'builtins.cc', 'checks.cc', 'cfg.cc',
+    'code-stubs.cc', 'codegen.cc', 'compilation-cache.cc', 'compiler.cc',
+    'contexts.cc', 'conversions.cc', 'counters.cc', 'dateparser.cc',
+    'debug.cc', 'debug-agent.cc', 'disassembler.cc', 'execution.cc',
+    'factory.cc', 'flags.cc', 'frame-element.cc', 'frames.cc',
+    'func-name-inferrer.cc', 'global-handles.cc', 'handles.cc',
+    'hashmap.cc', 'heap.cc', 'ic.cc', 'interpreter-irregexp.cc',
+    'jsregexp.cc', 'jump-target.cc', 'log.cc', 'log-utils.cc',
+    'mark-compact.cc', 'messages.cc', 'objects.cc', 'oprofile-agent.cc',
+    'parser.cc', 'property.cc', 'regexp-macro-assembler.cc',
+    'regexp-macro-assembler-irregexp.cc', 'regexp-stack.cc',
+    'register-allocator.cc', 'rewriter.cc', 'runtime.cc', 'scanner.cc',
+    'scopeinfo.cc', 'scopes.cc', 'serialize.cc', 'snapshot-common.cc',
+    'spaces.cc', 'string-stream.cc', 'stub-cache.cc', 'token.cc', 'top.cc',
+    'unicode.cc', 'usage-analyzer.cc', 'utils.cc', 'v8-counters.cc',
+    'v8.cc', 'v8threads.cc', 'variables.cc', 'version.cc',
     'virtual-frame.cc', 'zone.cc'
   ],
   'arch:arm': [
-    'arm/assembler-arm.cc', 'arm/builtins-arm.cc',
+    'arm/assembler-arm.cc', 'arm/builtins-arm.cc', 'arm/cfg-arm.cc',
     'arm/codegen-arm.cc', 'arm/cpu-arm.cc', 'arm/disasm-arm.cc',
     'arm/debug-arm.cc', 'arm/frames-arm.cc', 'arm/ic-arm.cc',
     'arm/jump-target-arm.cc', 'arm/macro-assembler-arm.cc',
@@ -63,7 +64,7 @@
     'arm/virtual-frame-arm.cc'
   ],
   'arch:ia32': [
-    'ia32/assembler-ia32.cc', 'ia32/builtins-ia32.cc',
+    'ia32/assembler-ia32.cc', 'ia32/builtins-ia32.cc', 'ia32/cfg-ia32.cc',
     'ia32/codegen-ia32.cc', 'ia32/cpu-ia32.cc', 'ia32/disasm-ia32.cc',
     'ia32/debug-ia32.cc', 'ia32/frames-ia32.cc', 'ia32/ic-ia32.cc',
     'ia32/jump-target-ia32.cc', 'ia32/macro-assembler-ia32.cc',
@@ -72,7 +73,7 @@
     'ia32/virtual-frame-ia32.cc'
   ],
   'arch:x64': [
-    'x64/assembler-x64.cc', 'x64/builtins-x64.cc',
+    'x64/assembler-x64.cc', 'x64/builtins-x64.cc', 'x64/cfg-x64.cc',
     'x64/codegen-x64.cc', 'x64/cpu-x64.cc', 'x64/disasm-x64.cc',
     'x64/debug-x64.cc', 'x64/frames-x64.cc', 'x64/ic-x64.cc',
     'x64/jump-target-x64.cc', 'x64/macro-assembler-x64.cc',