In a couple functions (type_update_when_use_rtti_test and

skip_type_update_when_not_use_rtti_test) the testcase assumes an
uninitialized object has a specific type. In particular, 'ptr' and
's'.

In reality the compiler is free to do what it wants with that
uninitialized variable, even initialize it beforehand with the future
assignment's value.  This is exactly what happens on some targets.

ptr should have type 'Base *', but it really has type 'Derived *'
because it is already initialized (earlier) by the compiler. The same
thing happens to 's'.

The following patch addresses this by explicitly initializing those
variables so the compiler doesn't optimize their assignments and GDB
can print their correct values.

2014-06-17  Luis Machado  <lgustavo@codesourcery.com>

	* gdb.mi/mi-var-rtti.cc (type_update_when_use_rtti_test):
	Initialize ptr and S explicitly.
	(skip_type_update_when_not_use_rtti_test): Likewise.

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