[m-rev.] problems with abs for int{8,16,32}

[Zoltan Somogyi]

The test cases arith_int{8,16,32} all fail in asm_fast.gc.debug.stseg
with an error like this:

--- arith_int16.exp	2018-01-15 18:23:15.388984921 +1100
+++ arith_int16.out	2018-02-15 08:53:39.853500020 +1100
@@ -28,7 +28,7 @@
 
 *** Test unary operation 'abs' ***
 
-abs -32768 = <<exception>>
+abs -32768 = -32768
 abs -128 = 128
 abs 0 = 0
 abs 1 = 1

The arith_int64 test case succeeds, and all the tests are fine
in asm_fast.gc as well.

I checked, and the abs operation on e.g. min_int8 throws
an exception, as expected, when invoked directly from main,
but the exception vanishes when invoked from within a try block.

Julien, I think fixing this is up to you. I am attaching my cut-down
test case to save you a bit of work.

(BTW, I just fixed a trivial failure of the breakpoints test
in debug grades.)

Zoltan.
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