[PATCH, ARM/libgloss]fix compilation error in linux-crt0.c when '-ffunction-sections' is specified

[Bin Cheng]

Hi,
Currently libgloss/arm/linux-crt0.c uses adr to get the address of
_start_thumb function.
It breaks the compilation when '-ffunction-sections' is specified, of which
we want to 
take advantage to decrease code size in binary.

Here is a patch fix this issue. 
I have compiled newlib/libgloss for various processor with or without
"-ffunction-sections"
successfully, Is it OK?

Thanks


2012-01-16  Bin Cheng  <bin.cheng@arm.com>

libgloss/
	* arm/linux-crt0.c: Use ldr instead of adr to get address of
_start_thumb.
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