[PATCH] Add warning to clang-reorder-fields when dependencies of init-list exprs are violated

[Sam Conrad via cfe-commits]

This adds a warning emitted by clang-reorder-fields when the reordering
fields breaks dependencies in the initializer list (such that
-Wuninitialized would warn).  For example, given:
Foo::Foo(int x)
  : a(x)
  , b(a) {}

Reordering fields to [b,a] gives:
Foo::Foo(int x)
  : b(a)
  , a(x) {}

Emits the warning:
2: Warning: reordering field a after b makes a uninitialized when used in
init expression.

The patch also reformats a few lines that were over 80 columns wide.
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