[PATCH] Fix printing GNU old-style field designators

[Nick Sumner]

Hi all,

The attached patch allows StmtPrinter to print old style field
designators in initializers. Given the code:
struct A { int b; int c; };
struct A a = {b: 3, .c = 4};

The initializer is presently printed as:
struct A a = {b: = 3, .c = 4};

The combination of ':' and '=' is invalid.

With the patch, the initializer is printed as:
struct A a = {b: 3, .c = 4};

Best,
Nick
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