Enable more CLIF tests on AArch64

The tests for the SIMD floating-point maximum and minimum operations
require particular care because the handling of the NaN values is
non-deterministic and may vary between platforms. There is no way to
match several NaN values in a test, so the solution is to extract the
non-deterministic test cases into a separate file that is subsequently
replicated for every backend under test, with adjustments made to the
expected results.

Copyright (c) 2021, Arm Limited.

cranelift/filetests/filetests/wasm/i64-memory64.clif

@@ -3,6 +3,7 @@ test compile
 
 ; We only test on 64-bit since the heap_addr instructions and vmctx parameters
 ; explicitly mention the pointer width.
+target aarch64
 target x86_64 haswell
 
 function %i64_load(i32, i64 vmctx) -> i64 {