[AArch64][SME] Make coalescer barrier available without +sme. (#85311)

For each call that changes the streaming-mode ISel inserts a
COALESCER_BARRIER node for the FP and (non-scalable) vector arguments to
the callee.

When calling a non-streaming function from a streaming-compatible
function, it's not required to have +sme (in case the SME code-path is
not actually executed at runtime). The patterns to match the
COALESCER_BARRIER however were still predicated with `HasSME`, which is
incorrect. This patch tries to fix that.