patch to fix constant math - first small patch - patch ping for the next stage 1

[Kenneth Zadeck]

Here is the first of my wide int patches with joseph's comments and the 
patch rot removed.

I would like to get these pre approved for the next stage 1.
On 10/05/2012 08:14 PM, Joseph S. Myers wrote:
> On Fri, 5 Oct 2012, Kenneth Zadeck wrote:
>
>> +# define HOST_HALF_WIDE_INT_PRINT "h"
> This may cause problems on hosts not supporting %hd (MinGW?), and there's
> no real need for using "h" here given the promotion of short to int; you
> can just use "" (rather than e.g. needing special handling in xm-mingw32.h
> like is done for HOST_LONG_LONG_FORMAT).
>

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2013-2-26  Kenneth Zadeck <zadeck@naturalbridge.com>

	* hwint.h (HOST_BITS_PER_HALF_WIDE_INT, HOST_HALF_WIDE_INT,
	HOST_HALF_WIDE_INT_PRINT, HOST_HALF_WIDE_INT_PRINT_C,
	HOST_HALF_WIDE_INT_PRINT_DEC, HOST_HALF_WIDE_INT_PRINT_DEC_C,
	HOST_HALF_WIDE_INT_PRINT_UNSIGNED, HOST_HALF_WIDE_INT_PRINT_HEX,
	HOST_HALF_WIDE_INT_PRINT_HEX_PURE): New symbols.
	(sext_hwi, zext_hwi): New functions.
	
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