[pushed] arm: fix testsuite failure of reg_equal_test.c [PR101755]

[Richard Earnshaw]

The test failure in PR101755 is due to the gimple optimizers getting
smarter.  But really we are just testing that RTL expansion is doing
the right thing and annotating a constant accordingly.  So rework the
test to use GIMPLE input and simplify the code entirely.  Also, this
test only ever worked on architecture versions with the MOVW/MOVT
instructions, so check for this before running.

gcc/testsuite/ChangeLog:

	PR target/101755
	* gcc.target/arm/reg_equal_test.c: Convert to gimple test.  Restrict
	to architectures with MOVW/MOVT.
---
 gcc/testsuite/gcc.target/arm/reg_equal_test.c | 25 ++++++-------------
 1 file changed, 8 insertions(+), 17 deletions(-)

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