Create multiple compilation jobs for ignition if compiling multiple literals

src/flag-definitions.h

Index: src/flag-definitions.h
diff --git a/src/flag-definitions.h b/src/flag-definitions.h
index 6ac8a28cb4e4923051c81bf7eefb47f5d01047e2..5c32dbd21f9f462ae9c1dac5fc3ed259b3452b2a 100644
--- a/src/flag-definitions.h
+++ b/src/flag-definitions.h
@@ -296,6 +296,8 @@ DEFINE_BOOL(ignition_staging, false, "use ignition with all staged features")
 DEFINE_IMPLICATION(ignition_staging, ignition)
 DEFINE_IMPLICATION(ignition_staging, ignition_osr)
 DEFINE_BOOL(ignition_eager, false, "eagerly compile and parse with ignition")
+DEFINE_BOOL(ignition_split_jobs, true,
+            "split eager compilation tasks into multiple jobs")
 DEFINE_STRING(ignition_filter, "*", "filter for ignition interpreter")
 DEFINE_BOOL(ignition_deadcode, true,
             "use ignition dead code elimination optimizer")
@@ -517,6 +519,10 @@ DEFINE_BOOL(wasm_loop_assignment_analysis, true,
 
 DEFINE_BOOL(validate_asm, false, "validate asm.js modules before compiling")
 
+// TODO(jochen): We should be able to split jobs even when validating.
+// http://crbug.com/v8/5506.
+DEFINE_NEG_IMPLICATION(validate_asm, ignition_split_jobs)
+
 DEFINE_BOOL(dump_wasm_module, false, "dump WASM module bytes")
 DEFINE_STRING(dump_wasm_module_path, NULL, "directory to dump wasm modules to")