[RFA] Suppress stap-trace.exp when compilation fails

[Keith Seitz]

Hi,

stap-trace.exp does not check the return value of its compile-a-testcase 
wrapper procedure, so when compilation of the test case fails, it 
attempts to run the tests anyway instead of nicely bailing out.

This patch addresses this by fixing the compile wrapper to always return 
a valid value and checking this procedure's return value before running 
the tests.

Okay?
Keith

testsuite/ChangeLog

2012-05-23  Keith Seitz  <keiths@redhat.com>

	* gdb.trace/stap-trace.exp: If compile_stap_bin fails,
	return -1 to suppress the rest of the tests.
	(compile_stap_bin): Return boolean success value.

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