[debugger, interpreter] add break location at if-statement.

test/mjsunit/mjsunit.status

 # Copyright 2012 the V8 project authors. All rights reserved.
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 # modification, are permitted provided that the following conditions are
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 #
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@@ skipping 782 matching lines @@
   'debug-liveedit-patch-positions': [FAIL],
   'debug-liveedit-stepin': [FAIL],
   'debug-liveedit-newsource': [FAIL],
   'debug-liveedit-stack-padding': [FAIL],
   'debug-liveedit-breakpoints': [FAIL],
   'debug-stepin-accessor-ic': [FAIL],
   'debug-stepnext-do-while': [FAIL],
 
   # TODO(yangguo,4690): Check failure in debug.cc BreakLocation::SetBreakPoint
   # DCHECK(IsDebugBreak() || IsDebuggerStatement());
-  'regress/regress-1523': [FAIL],
   'regress/regress-crbug-119800': [FAIL],
   'regress/regress-crbug-467180': [FAIL],
   'regress/regress-opt-after-debug-deopt': [FAIL],
 
   # TODO(rmcilroy,4681): Requires support for generators.
   'messages': [FAIL],
   'es6/array-from': [FAIL],
   'regress-3225': [FAIL],
   'es6/classes-subclass-builtins': [FAIL],
   'es6/computed-property-names-classes': [FAIL],
@@ skipping 84 matching lines @@
   # Tests taking too long.
   'array-functions-prototype-misc': [SKIP],
   'strong/implicit-conversions': [SKIP],
   'strong/load-element-mutate-backing-store': [SKIP],
 
   # Stack overflow.
   'big-array-literal': [SKIP],
 }],  # 'gcov_coverage'
 
 ]