Separate CompilationInfo into its own file.

src/crankshaft/lithium-codegen.cc

Index: src/crankshaft/lithium-codegen.cc
diff --git a/src/crankshaft/lithium-codegen.cc b/src/crankshaft/lithium-codegen.cc
index 5041de6451f01cef793b83d6f2be7f30b3f7846f..decc2a596f9f37684e6951fc442b4d6af1a4be93 100644
--- a/src/crankshaft/lithium-codegen.cc
+++ b/src/crankshaft/lithium-codegen.cc
@@ -66,6 +66,8 @@ LCodeGenBase::LCodeGenBase(LChunk* chunk, MacroAssembler* assembler,
       source_position_table_builder_(info->zone(),
                                      info->SourcePositionRecordingMode()) {}
 
+Isolate* LCodeGenBase::isolate() const { return info_->isolate(); }
+
 bool LCodeGenBase::GenerateBody() {
   DCHECK(is_generating());
   bool emit_instructions = true;