[PATCH] Make global aliases have symbol size equal to their type

[John Brawn]

In http://reviews.llvm.org/D10837#197109, @rafael wrote:

> Why do you need to print the .size in the assembly? The assembler
>  itself (MC/gas) propagates the size.


Yes, but it propagates it from the aliasee. In global-merge-2.ll, for example, if you generate object output then inspect the symbol table it says

0000000000000000 g       .bss		 0000000c x
0000000000000004 g       .bss		 0000000c y
0000000000000008 g       .bss		 0000000c z

which says that x is 12-bytes in size starting at offset 8 inside the .bss section. As x was originally (before GlobalMerge) a 4-byte variable this is slightly surprising, plus the .bss section is 12 bytes long so z apparently extends past the end of the .bss section.


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