LLVM 17 regression: floating point behavior tests on arm

[andrewrk]

zig version: 0.12.0-dev.116+4cc2544cd (llvm17 branch)

$ zig build test-behavior -fqemu
run test behavior-arm-linux-musleabihf-Debug-libc: error: 'test.@mulAdd f80' failed: /home/andy/misc/zig/lib/std/testing.zig:519:14: 0x9a44f in expect (test)
    if (!ok) return error.TestUnexpectedResult;
             ^
/home/andy/misc/zig/test/behavior/muladd.zig:69:5: 0x1cc22b in testMulAdd80 (test)
    try expect(@mulAdd(f80, a, b, c) == 20);
    ^
/home/andy/misc/zig/test/behavior/muladd.zig:62:5: 0x1cc26f in test.@mulAdd f80 (test)
    try testMulAdd80();
    ^
run test behavior-arm-linux-musleabihf-Debug-libc: error: 'test.@mulAdd f128' failed: /home/andy/misc/zig/lib/std/testing.zig:519:14: 0x9a44f in expect (test)
    if (!ok) return error.TestUnexpectedResult;
             ^
/home/andy/misc/zig/test/behavior/muladd.zig:89:5: 0x1cc38f in testMulAdd128 (test)
    try expect(@mulAdd(f128, a, b, c) == 20);
    ^
/home/andy/misc/zig/test/behavior/muladd.zig:82:5: 0x1cc3d3 in test.@mulAdd f128 (test)
    try testMulAdd128();
    ^
run test behavior-arm-linux-musleabihf-Debug-libc: error: 'test.float widening f16 to f128' failed: m
/home/andy/misc/zig/lib/std/testing.zig:519:14: 0x9a44f in expect (test)
    if (!ok) return error.TestUnexpectedResult;
             ^
/home/andy/misc/zig/test/behavior/widening.zig:73:5: 0x21bba3 in test.float widening f16 to f128 (test)
    try expect(x == y);
    ^
run test behavior-arm-linux-musleabihf-Debug-libc: error: while executing test 'test.no clobbering happened', the following test command failed:
qemu-arm /home/andy/misc/zig/zig-cache/o/cd445b01a9147e3ed51291a504dc55dc/test --listen=- 

Next step is to file an upstream bug report with an LLVM IR reduction. Hopefully it can get fixed before the final 17 tag.

[jacobly0]

Fixed by 5160752