[PATCH] Fix testcases to avoid plusminus-with-convert pattern (PR 97066)

[Feng Xue OS]

With the new pattern rule (T)(A) +- (T)(B) -> (T)(A +- B),
some testcases are simplified and could not keep expected
code pattern as test-check. Minor changes are made to those
cases to avoid simplification effect of the rule.

Tested on x86_64-linux and aarch64-linux.

Feng
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2020-09-16  Feng Xue  <fxue@os.amperecomputing.com>

gcc/testsuite/
	PR testsuite/97066
	* gcc.dg/ifcvt-3.c: Modified to suppress simplification.
	* gcc.dg/tree-ssa/20030807-10.c: Likewise.
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