[Commmitted] Move some testcases to torture from tree-ssa

While writing up some testcases, I noticed some newer testcases
just had "dg-do compile/run" on them with dg-options of either -O1
or -O2. Since it is always better to run them over all optimization
levels I put them in gcc.c-torture/compile or gcc.c-torture/execute.

Committed after testing to make sure the testcases pass.

gcc/testsuite/ChangeLog:

	* gcc.dg/tree-ssa/pr100278.c: Move to ...
	* gcc.c-torture/compile/pr100278.c: Here.
	Remove dg-do and dg-options.
	* gcc.dg/tree-ssa/pr101189.c: Move to ...
	* gcc.c-torture/compile/pr101189.c: Here.
	Remove dg-do and dg-options.
	* gcc.dg/tree-ssa/pr100453.c: Move to ...
	* gcc.c-torture/execute/pr100453.c: Here.
	Remove dg-do and dg-options.
	* gcc.dg/tree-ssa/pr101335.c: Move to ...
	* gcc.c-torture/execute/pr101335.c: Here
	Remove dg-do and dg-options.