[Interpreter] Adds support for const/let variables to interpreter.

test/mjsunit/mjsunit.status

Index: test/mjsunit/mjsunit.status
diff --git a/test/mjsunit/mjsunit.status b/test/mjsunit/mjsunit.status
index 0b4a950c4a38f354ed7e2ab4b7948f06ec1c3110..20bfa6b1f1e3063f37de293335d9ea62aed965d1 100644
--- a/test/mjsunit/mjsunit.status
+++ b/test/mjsunit/mjsunit.status
@@ -747,7 +747,6 @@
 }],  # 'arch == ppc and simulator_run == True'
 
 ['ignition == True', {
-  'const*': [SKIP],
   'debug-*': [SKIP],
   'es6/*': [SKIP],
   'es7/*': [SKIP],
@@ -774,20 +773,14 @@
   'compiler/deopt-tonumber-compare': [SKIP],
   'compiler/expression-trees': [SKIP],
   'compiler/regress-446647': [SKIP],
-  'compiler/regress-447567': [SKIP],
-  'compiler/regress-96989': [SKIP],
-  'compiler/regress-const': [SKIP],
   'compiler/regress-funarguments': [SKIP],
   'compiler/regress-stacktrace-methods': [SKIP],
   'compiler/strict-recompile': [SKIP],
   'cyclic-array-to-string': [SKIP],
   'd8-worker-sharedarraybuffer': [SKIP],
-  'declare-locally': [SKIP],
   'deserialize-optimize-inner': [SKIP],
-  'eval-enclosing-function-name': [SKIP],
   'eval-stack-trace': [SKIP],
   'field-type-tracking': [SKIP],
-  'global-const-var-conflicts': [SKIP],
   'global-hash': [SKIP],
   'messages': [SKIP],
   'property-load-across-eval': [SKIP],
@@ -799,7 +792,6 @@
   'regress/regress-109195': [SKIP],
   'regress/regress-1114040': [SKIP],
   'regress/regress-1170187': [SKIP],
-  'regress/regress-1178598': [SKIP],
   'regress/regress-119609': [SKIP],
   'regress/regress-1199637': [SKIP],
   'regress/regress-1200351': [SKIP],
@@ -815,7 +807,6 @@
   'regress/regress-1639': [SKIP],
   'regress/regress-1790': [SKIP],
   'regress/regress-1853': [SKIP],
-  'regress/regress-186': [SKIP],
   'regress/regress-1980': [SKIP],
   'regress/regress-2318': [SKIP],
   'regress/regress-2618': [SKIP],
@@ -825,7 +816,6 @@
   'regress/regress-2825': [SKIP],
   'regress/regress-353551': [SKIP],
   'regress/regress-354357': [SKIP],
-  'regress/regress-3926': [SKIP],
   'regress/regress-3960': [SKIP],
   'regress/regress-3969': [SKIP],
   'regress/regress-3985': [SKIP],
@@ -840,7 +830,6 @@
   'regress/regress-4309-3': [SKIP],
   'regress/regress-4320': [SKIP],
   'regress/regress-4374': [SKIP],
-  'regress/regress-4388': [SKIP],
   'regress/regress-446389': [SKIP],
   'regress/regress-447756': [SKIP],
   'regress/regress-4509-Class-constructor-typeerror-realm' : [SKIP],
@@ -857,7 +846,6 @@
   'regress/regress-544991': [SKIP],
   'regress/regress-572589': [SKIP],
   'regress/regress-799761': [SKIP],
-  'regress/regress-88591': [SKIP],
   'regress/regress-94873': [SKIP],
   'regress/regress-97116b': [SKIP],
   'regress/regress-97116': [SKIP],