[turbofan] Disable loop peeling for asm.js.

src/compilation-info.h

Index: src/compilation-info.h
diff --git a/src/compilation-info.h b/src/compilation-info.h
index 2abf624fdf1b002b4bb6d68f839d6285f08a369b..863183b5cd3516b2007e05463b615d805b93d788 100644
--- a/src/compilation-info.h
+++ b/src/compilation-info.h
@@ -49,6 +49,7 @@ class CompilationInfo final {
     kSourcePositionsEnabled = 1 << 13,
     kBailoutOnUninitialized = 1 << 14,
     kOptimizeFromBytecode = 1 << 15,
+    kLoopPeelingEnabled = 1 << 16,
   };
 
   CompilationInfo(ParseInfo* parse_info, Handle<JSFunction> closure);
@@ -172,6 +173,10 @@ class CompilationInfo final {
     return GetFlag(kOptimizeFromBytecode);
   }
 
+  void MarkAsLoopPeelingEnabled() { SetFlag(kLoopPeelingEnabled); }
+
+  bool is_loop_peeling_enabled() const { return GetFlag(kLoopPeelingEnabled); }
+
   bool GeneratePreagedPrologue() const {
     // Generate a pre-aged prologue if we are optimizing for size, which
     // will make code flushing more aggressive. Only apply to Code::FUNCTION,