Split off a separate --harmony_sloppy_let flag

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

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-// Flags: --no-legacy-const --harmony-sloppy
+// Flags: --no-legacy-const --harmony-sloppy --harmony-sloppy-let
 
 // We want to test the context chain shape.  In each of the tests cases
 // below, the outer with is to force a runtime lookup of the identifier 'x'
 // to actually verify that the inner context has been discarded.  A static
 // lookup of 'x' might accidentally succeed.
 
 {
   let x = 2;
   L: {
     let x = 3;
@@ skipping 176 matching lines @@
       let x = 'inner';
       throw 0;
     } finally {
       f();
       assertEquals('outer', eval('x'));
     }
   })('outer');
 } catch (e) {
   if (e instanceof MjsUnitAssertionError) throw e;
 }