[gomp4] mangle linear step of 1 with just 'l'

[Aldy Hernandez <aldyh at redhat dot com>]

Hi Jakub.

Your patch mangling negative linear steps caused a regression in 
simd-clones-2.c.  Well, it already had a failure, but now it has two :).

The problem is that AFAIU, a linear step of 1, is mangled with just 'l', 
not 'l1'.

I am not completely sure of this, and was hoping Balaji could clear this 
up, but on page 7 of the Intel vector ABI document, the example for:

__declspec(vector(uniform(a), aligned(a:32), linear(k:1)))
extern float setArray(float *a, float x, int k)

...is mangled as _ZGVxN4ua32vl_setArray, and in the subsequent 
explanatory paragraph, the document specifically says:

	“l” indicates linear(k:1) – k is a linear variable whose stride is 1.

However, since the spec itself says nothing about a default linear 
stride 1, I don't know whether this is an oversight in the BNF grammar 
or a typo in the example.  Balaji?

If a linear step of 1 is mangled as 'l' as the example suggests, then 
I'd like to commit the following patch.

Aldy

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