This patch marks a rev16 test as XFAIL for architectures having only 
Thumb1 support. The generated code is functionally correct, but the 
optimization is disabled when -mthumb is equivalent to Thumb1. Fixing 
the root issue would requires changes that are not suitable for GCC14 
stage 4.

More information at https://linaro.atlassian.net/browse/GNU-1141

gcc/testsuite/ChangeLog:

	* gcc.target/arm/rev16_2.c: XFAIL when compiled with Thumb1.