Split off a separate --harmony_sloppy_let flag

test/mjsunit/harmony/block-for-sloppy.js

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-// Flags: --no-legacy-const --harmony-sloppy
+// Flags: --no-legacy-const --harmony-sloppy --harmony-sloppy-let
 
 function props(x) {
   var array = [];
   for (let p in x) array.push(p);
   return array.sort();
 }
 
 assertEquals(0, props({}).length);
 assertEquals(1, props({x:1}).length);
 assertEquals(2, props({x:1, y:2}).length);
@@ skipping 151 matching lines @@
 assertEquals(0, eval("for (let i = 0; true;) { i; break; }"));
 assertEquals(0, eval("for (const i = 0; true;) { i; break; }"));
 assertEquals(9, eval("for (let i = 0; i < 10; i++) { i; continue; }"));
 assertEquals(3, eval("for (let i = 0; true; i++) { i; if (i >= 3) break; }"));
 assertEquals(2, eval("for (let i = 0; true; i++) { if (i >= 3) break; i; }"));
 assertEquals(
   2, eval("for (let i = 0; i < 10; i++) { if (i >= 3) continue; i; }"));
 assertEquals(undefined, eval("foo: for (let i = 0; true;) { break foo; }"));
 assertEquals(undefined, eval("foo: for (const i = 0; true;) { break foo; }"));
 assertEquals(3, eval("foo: for (let i = 3; true;) { i; break foo; }"));