[committed][OG10] Fix offload dwarf info

[Andrew Stubbs]

This patch corrects a problem in which GDB ignores the debug info for 
offload kernel entry functions because they're represented as nested 
functions inside a function that does not exist on the accelerator 
device (only on the host).

The fix is to add a notional code range to the non-existent parent 
function. Setting it the same as the inner function is good enough 
because GDB selects the innermost.

I'll submit this the mainline when stage 1 opens. Committed to 
devel/omp/gcc-10 for now.

Andrew
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