testsuite: arm: xfail predcom-8.c test in hard float without MVE [PR118407]

In r15-6807-g68326d5d1a593d, more early break loops were vectorized.
This change causes the test to fail:

$ arm-none-eabi-gcc gcc.dg/tree-ssa/predcom-8.c \
    -mthumb -march=armv7ve+neon -mtune=cortex-a7 -mfloat-abi=hard -mfpu=auto \
    -O3 -fdump-tree-pcom-details-blocks -S -o predcom-8.s && grep "Invalid sum" predcom-8.*.pcom
;;   Invalid sum of incoming counts 267993001 (estimated locally, freq 2.3331), should be 234459439 (estimated locally, freq 2.0412)
;;   Invalid sum of incoming counts 31724316 (estimated locally, freq 0.2762), should be 78153146 (estimated locally, freq 0.6804)
;;   Invalid sum of incoming counts 37162368 (estimated locally, freq 0.3235), should be 67298542 (estimated locally, freq 0.5859)
;;   Invalid sum of incoming counts 487993506 (estimated locally, freq 4.2485), should be 471089795 (estimated locally, freq 4.1013)
;;   Invalid sum of incoming counts 140991263 (estimated locally, freq 1.2275), should be 114863531 (estimated locally, freq 1.0000)

The failures only happens for non-MVE targets in hard float ABI, thus
xfail test for these targets.

gcc/testsuite/ChangeLog:

	PR testsuite/118407
	* gcc.dg/tree-ssa/predcom-8.c: Xfail test for arm*-*-* in hard
	float ABI without MVE.

Signed-off-by: Torbjörn SVENSSON <torbjorn.svensson@foss.st.com>
(cherry picked from commit 383854a7016ad2381165b66cba79dd88f24678ab)