[PATCH]Use "unsigned int" instead of "int" to hold alignment in emit_local function.

[Renlin Li]

Hi all,

This is a simple patch to change the align variable (used in 
emit_local()) from type "int" to type "unsigned int".

It should be defined as "unsigned int" which is the same data type 
returned by symtab_node::get (decl)->definition_alignment ()
For the maximum alignment allowed by GCC(without producing "error: 
requested alignment is too large"), "int" will overflow.

Okay to Commit on the trunk and backport to branch 5.0?

Regards,
Renlin Li

gcc/ChangeLog:

2015-06-04  Renlin Li  <renlin.li@arm.com>

     * varasm.c (emit_local): Use unsigned int for align variable.
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