Previously GAS would accept .u32, .u16 and .u8 suffixes to the VQ(R)DMLAH and VQ(R)DMLASH
instructions, however the Armv8.1-M Mainline specification states that these functions only
have signed variations (.s32, .s16 and .s8 suffixes).
This is documented here:
https://static.docs.arm.com/ddi0553/bh/DDI0553B_h_armv8m_arm.pdf?_ga=2.143079093.1892401233.1563295591-999473562.1560847439#page=1183
gas * config/tc-arm.c (do_mve_vqdmlah): Use N_S_32 macro.
(do_neon_qrdmlah): Use N_S_32 macro.
* testsuite/gas/arm/mve-vqdmlah-bad.d: New test.
* testsuite/gas/arm/mve-vqdmlah-bad.l: New test.
* testsuite/gas/arm/mve-vqdmlah-bad.s: New test.
* testsuite/gas/arm/mve-vqdmlah.d: Remove unsigned instruction tests.
* testsuite/gas/arm/mve-vqdmlah.s: Remove unsigned instruction tests.
* testsuite/gas/arm/mve-vqdmlash-bad.d: New test.
* testsuite/gas/arm/mve-vqdmlash-bad.l: New test.
* testsuite/gas/arm/mve-vqdmlash-bad.s: New test.
* testsuite/gas/arm/mve-vqdmlash.d: Remove unsigned instruction tests.
* testsuite/gas/arm/mve-vqdmlash.s: Remove unsigned instruction tests.
opcodes * arm-dis.c: Only accept signed variants of VQ(R)DMLAH and VQ(R)DMLASH
instructions.